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题目
He____on his new book for months before he fell ill,or we would have found it in the market.
A.had been working B.has been working C.was working D.will have worked

提问时间:2020-11-03

答案
选A
过去一直进行到他生病.or后面的句子也体现出了过去相反的假设.
用过去完成进行时.
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