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英语语法6.I ____C____ him the answer ________ possible,but I was

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英语语法
6.I ____C____ him the answer ________ possible,but I was so busy then.
A.could tell,if it had been
B.must have told,were it
C.should have told,had it been
D.should have told,should it be
这里正确的用C?为什么不是用D吗?难度 the answer ________ possible是从句吗?
英语语法6.I ____C____ him the answer ________ possible,but I was
这句话是这样的：Had it beeb possible,I should have told him the answer.
前面的是从句,后面的是主句.你题目里只是翻了个个.
从句里因为把连词if给省略了,所以使用部分倒装,把助动词提前了,从句的意思：如果当时有可能的话,与过去相反.所以用了过去完成式.主句由情态动词的过去式加上动词的完成式构成.should have told应该不用解释了.
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