He ----- without having breakfast.a.had used to go to school

问题描述:

He _____ without having breakfast.a.had used to go to school b.has used to go to school
1个回答 分类:英语 2014-09-18

问题解答:

我来补答
B
只有当从句中是过去时,这时主句的动作发生在从句之前才能够用过去完成时!
 
 
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