Iwon’ttellthestudenttheanswertothemathproblemuntilhe
來源:國語幫 5.13K
問題詳情:
I won’t tell the student the answer to the math problem until he ________ on it for more than an hour.
A. has been working B. will have worked C. would have worked D. had worked
【回答】
B
知識點:動詞時態與語態
題型:選擇題