首先A中,had 表示在另一个动作之后,可是前面want跟这个hand in 的动作几乎同时,所以排除.
B中,would have done 表示一种一种虚拟,推测,跟题目没有关系.
C中,have就多了,have done 表示这个动作对现在的影响.
D,hand in 是瞬间动作,怎么能用进行时呢?
the teacher wants to know whether we __ in our papers. A had
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