Bob would have helped us yesterday,but he        

  A. was busy  B.is busy  C had been busy   D.will be busy

 

A

考查句子的時(shí)態(tài)。 題意:昨天Bob本來(lái)會(huì)幫助我們的,可是(當(dāng)時(shí))他很忙。根據(jù)前半句中的時(shí)間副詞yesterday和句意可知,本句應(yīng)該使用一般過(guò)去時(shí)。

 

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