Question

【题目】 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

Answer 1

【答案】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。