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状语从句(状语从句)

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He coundn't go to the park because he ( )look after his brother A had to B will have to C has to D have to 为什么选A 不选C?
解题思路: 从时态上来考虑这个问题就可解决。
解题过程:
He coundn't go to the park because he ( )look after his brother
A had to B will have to C has to D have to
为什么选A 不选C?
考点:动词的时态。
分析:
有些句子判断时态时有明显的时间状语,但也有一些句,是通过上下文的关系,或上下句来判断时态的,如你说的这个句子,就是根据He coundn't go to the park 是过去时,来判断后面句子的时态,也要用过去时,所以选A。有时,前后句是判断时态的相互根据。
不能去公园是过去,照看他的弟弟也是那时。(过去)
最终答案:略