He____on his new book for months before he fell ill,or we would have found it in the market.

He____on his new book for months before he fell ill,or we would have found it in the market.

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
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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