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I ________ my homework for four hours, b...

I ________ my homework for four hours, but I am not sure whether I   can hand it in tomorrow.

A. have done          B. have been doing

C. had been doing     D. had done

 

B 【解析】 试题分析:考查时态。句意:四个小时以来,我一直都在做家庭作业,但是我不确信我是否能在明天上交它。现在完成进行时通常表示过去发生的事情延续到现在,而且还在继续发生,强调事情的延续性和反复性。故B正确。 考点:考查时态  
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