单选题
—I took the TOEFL. It was really hard.
—______a lot before you took it?
A、
Have you studied
B、
Did you study
C、
Had you studied
D、
Do you study
【正确答案】
C
【答案解析】
[解题指要] 表示过去的过去用过去完成时。答语中before you took it要求该题主句应选用过去完成时态与之配合。
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