作业帮求英语高手帮忙
来源：学生作业帮 编辑：拍题作业网作业帮 分类：英语作业 时间：2024/05/02 04:28:24
Nearly three months had gone by ________ the seriously injured girl showed a slight sign of recovery. A. until B. after C. since D. before 劳驾把这四者的区别以及答案说一下
解题思路： 理解连词含义，表达的逻辑关系，辨析及主从句谓语时态的要求等
解题过程：
Nearly three months had gone by ________ the seriously injured girl showed a slight sign of recovery. A. until B. after C. since D. before 你好，解析如下：
答案：D 句意：几乎过了三个月受伤严重的女孩才有了轻微康复的迹象。
考点：引导时间状语的连词。
until+从句。not until / till意为“直到……才”，主句常用终止性动词（即非延续性），表示until /till所表示的时间一到，该动作就发生。
如：Einstein was not able to return to his homeland until the war was over.直到战争结束后爱因斯坦才得以回国。
注意：not until放在句首时要用倒装语序，如例句可以改为放在句首的倒装句：Not until the war was over was Einstein able to return to his homeland.
after 在 之后。与before 相反。此处翻译不通。
since 自从。1>since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
2> It is +一段时间+ since从句
It is two years since I became a postgraduate student.
before 用法：在 之前；还没来得及 就； 才
用在含有before的主从复合句中
用在含有before的主从复合句中，一般在从句中使用一般过去时，主句中使用过去完成时。例如：
Lily had written some letters before she went out shopping.
有时，也可以在从句中用过去完成时，主句中用一般过去时，这样就可使描述更为生动。试比较：
We got to the station before the train had left. 火车尚未开动之前，我们就到了车站。
We had got to the station before the train left. 火车开出之前，我们就已经到了车站。
像after一样， before本身就能明确地表示时间的先后关系，故多数主从句均使用一般过去时，而无需使用过去完成时。例如：
Many people left for home before the film ended.电影尚未放完，许多人就起身回家了。
原你满意。
最终答案：略
解题过程：
Nearly three months had gone by ________ the seriously injured girl showed a slight sign of recovery. A. until B. after C. since D. before 你好，解析如下：
答案：D 句意：几乎过了三个月受伤严重的女孩才有了轻微康复的迹象。
考点：引导时间状语的连词。
until+从句。not until / till意为“直到……才”，主句常用终止性动词（即非延续性），表示until /till所表示的时间一到，该动作就发生。
如：Einstein was not able to return to his homeland until the war was over.直到战争结束后爱因斯坦才得以回国。
注意：not until放在句首时要用倒装语序，如例句可以改为放在句首的倒装句：Not until the war was over was Einstein able to return to his homeland.
after 在 之后。与before 相反。此处翻译不通。
since 自从。1>since +从句
Great changes have taken place since you left.
Considerable time has elapsed since we have been here.
2> It is +一段时间+ since从句
It is two years since I became a postgraduate student.
before 用法：在 之前；还没来得及 就； 才
用在含有before的主从复合句中
用在含有before的主从复合句中，一般在从句中使用一般过去时，主句中使用过去完成时。例如：
Lily had written some letters before she went out shopping.
有时，也可以在从句中用过去完成时，主句中用一般过去时，这样就可使描述更为生动。试比较：
We got to the station before the train had left. 火车尚未开动之前，我们就到了车站。
We had got to the station before the train left. 火车开出之前，我们就已经到了车站。
像after一样， before本身就能明确地表示时间的先后关系，故多数主从句均使用一般过去时，而无需使用过去完成时。例如：
Many people left for home before the film ended.电影尚未放完，许多人就起身回家了。
原你满意。
最终答案：略