【題目】Tom ______ an experiment when someone knocked at the door.

A. does B. did C. is doing D. was doing

【答案】D

【解析】

試題分析:句意:當(dāng)有人敲門(mén)時(shí)湯姆正在做實(shí)驗(yàn)。根據(jù)句意及語(yǔ)境此題應(yīng)用過(guò)去進(jìn)行時(shí)態(tài),故選D。

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