Question

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

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

Answer 1

【答案】B

【解析】

句意：當(dāng)我進(jìn)教室時(shí)，我的朋友鮑勃正在打掃地板。

考查時(shí)間狀語(yǔ)從句、時(shí)態(tài)。A. is cleaning（現(xiàn)在進(jìn)行時(shí)）；B. was cleaning（過(guò)去進(jìn)行時(shí)）；C. cleaned（一般過(guò)去式）；D. has cleaned（現(xiàn)在完成時(shí)）；when引導(dǎo)的時(shí)間狀語(yǔ)從句指特定時(shí)間正在發(fā)生的動(dòng)作，根據(jù)主從句時(shí)態(tài)一致的原則，判斷主句用過(guò)去進(jìn)行時(shí)，故選B。