When all those present ___he begin his lecture.

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When all those present ___he begin his lecture.
A.sit B.were seatd
我还是有点不明白为什么选A,不是说sit是不及物动词,后面就不能加宾语了吗
老师说把空格后面括起来,不管.为什么呢?
这个句子的宾语是哪个?
为什么空格后面的句子可以括起来无视掉呢?

首先,sit也可以作为及物动词,这时候的意思是“使就坐”；
这个句子可以当做一个条件句,前面的When all those present sit 是条件,“当所有来宾就坐”,然后he begin his lecture,他才开始了演讲.这中间省略了连接词that,即就是When all those present (that) he begins his lecture.或者可以写成分句,When all those present sit, (that/then)he begins his lecture. 当然,你也可以理解为时间状语从句,When all those present sit,“当所有来宾都就坐的时候”,做后面主句he begin his lecture的时间状语,因此,后面的主句是句子的主体了,时间从句用来表示一种状态.
英语里句子的完整要包括主语和谓语,而宾语则可以没有,如Yea,I do.这句简单的答句,就只有主谓.那么对于问题1,前面的条件没有宾语,可是是完整的句子.问题2,这段话整句是个条件从句（也可当时间从句）,那么后面的主句是个完整的句子,前面的句子作为修饰,即可以分开来看.

When all those present ___he begin his lecture. 英语时态：When all those present were seated he began his lecture 关于seat的用法When all those present ______ he bagan his lecture. When all those present(到场者)__ he began his lecture.A.sit B.s all those present _______ he began his lecture. When all those present___he began his lecture.(D) When all those present___he began his lecture.A.sit B.set C. 1,--When will the lecture begin? Finally came the day ___he had to begin his study for the ne Uncle wang gave all his savings to zhe hope school ___he him when lost in work,___he often was,he would forget all about 英语小问题A famous scientist is on his way to a lecture when his