【題目】When I got to the classroom, my friend Bob__the floor.

A. is cleaningB. was cleaningC. cleanedD. has cleaned

【答案】B

【解析】

句意:當我進教室時,我的朋友鮑勃正在打掃地板。

考查時間狀語從句、時態(tài)。A. is cleaning(現(xiàn)在進行時);B. was cleaning(過去進行時);C. cleaned(一般過去式);D. has cleaned(現(xiàn)在完成時);when引導的時間狀語從句指特定時間正在發(fā)生的動作,根據(jù)主從句時態(tài)一致的原則,判斷主句用過去進行時,故選B

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