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He looked as if he ­­­_____ the answer.
A.knewB.had knownC.knows D.has known
B
本题考查as if后接从句使用虚拟语气的用法。如果as if后面的从句表示与过去的事实相反使用过去完成时;as if后面的从句表示与现在或者将来的事实相反,句子中用过去时。本句是与过去事实相反,所以选择B。
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