【題目】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

【答案】B
【解析】考查時(shí)態(tài)。句意：四個(gè)小時(shí)以來，我一直都在做家庭作業(yè)，但是我不確信我是否能在明天上交它�，F(xiàn)在完成進(jìn)行時(shí)通常表示過去發(fā)生的事情延續(xù)到現(xiàn)在，而且還在繼續(xù)發(fā)生，強(qiáng)調(diào)事情的延續(xù)性和反復(fù)性。故B正確。

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