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the truth, he wouldn't have helped her at all.A.Should Bob knowB.Had Bob knownC.

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the truth, he wouldn't have helped her at all.A.Should Bob knowB.Had Bob knownC.

________ the truth, he wouldn't have helped her at all.

A.Should Bob know

B.Had Bob known

C.Were Bob to know

D.Have Bob known

试题答案

B