— Has Jack finished his homework yet?

— I have no idea；he ＿＿it this morning.

A. was doing    B. had been doing    C. has done      D. did

 

【答案】

A

【解析】

題干沒有構(gòu)成“過去的過去”，不可選B。如選C、D則表示動(dòng)作已完成，與have no idea相矛盾。過去進(jìn)行時(shí)表示過去某段時(shí)間或某一時(shí)刻正在進(jìn)行的動(dòng)作，不涉及結(jié)果，正好附合題干語境。

 

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