When she came out, Mary looked a bit tired because she the house.A. cleaned B. was C. had cleaned D.had been cleaning [解析]D:本題考查動(dòng)詞時(shí)態(tài).側(cè)重說(shuō)明在she came out之前的動(dòng)作.D項(xiàng)為過(guò)去進(jìn)行時(shí).表示從過(guò)去某一時(shí)間開始到過(guò)去某一時(shí)間一直進(jìn)行的動(dòng)作. 【查看更多】

 

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When she came out, Mary looked a bit tired because she _____the house.

A. cleaned  B. was  C. had cleaned  D.had been cleaning

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.When she came out, Mary looked a bit tired because she _____the house.

A. cleaned          B. was           C. had cleaned        D.had been cleaning

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When she came out, Mary looked a bit tired because she ____ the house.

  A. cleaned                 B. was cleaning             C. had cleaned                     D. had been cleaning

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When she came out, Mary looked a bit tired because she     the house.

A. cleaned   B. was cleaning    C. had cleaned      D. had been cleaning

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.When she came out, Mary looked a bit tired because she _____the house.

A．cleaned

B．was

C．had cleaned

D．had been cleaning

 

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