UC知道he studied the picture, which ___ in the summer time
来源：百度知道 编辑：UC知道 时间：2024/06/05 05:11:44
A. has taken
B. had been taken
C. has been taken
D. taken
选择B.为什么用过去完成时啊
B. had been taken
C. has been taken
D. taken
选择B.为什么用过去完成时啊
picture 是物品啊，要用被动语态 比如picture is taken.
而这句话是定语从句，主句已经用了一般过去时，那么从句也需要使用【过去时态】，那么这四个选项里，只有B是过去完成时的被动语态，因此选B。
因为是过去发生的 而且已经学成了
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He studied medicine as well as surgery.
if he studied harder中为什么要用studied而不是studys
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