him well, I would have invited him to my birthday partyA.Had I knownB.Should I k
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______ him well, I would have invited him to my birthday party
A.Had I known
B.Should I know
C.If I know
D.If I knew
试题答案
A
考查虚拟语气。根据句意考查与过去事实相反的虚拟语气，故从句用had + v-ed。Had I known =" If" I had known。句意：如果我很了解他的话，我将邀请他参加我的生日晚会。