he pretended to have read the book before 有三个问号哦这句子是现在完成时吗?若是,那请问为什么用现在完成时,而不用过去完成时呢?用了过去完成时意义是什么?

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• he pretended to have read the book before 有三个问号哦这句子是现在完成时吗?若是,那请问为什么用现在完成时,而不用过去完成时呢?用了过去完成时意义是什么?
• He seemed to have read the book before.转换句子换成It ___ ___ ___ ___ ___ the book before.
• -----Have you finished _____ the book? -----Not yet,I will try ___ it to you before Friday.A.reading;returningB.to read;to returnC.reading;to returnD.to fead;return