15.Antony and Tom are good friends.They ______ each other for ten years.(  )
A.knewB.knowC.have knownD.had known

分析 Antony 和 Tom是好朋友.他們互相認(rèn)識已經(jīng)十年了.

解答 答案:C.
根據(jù)for ten years.可知這里的意思是"十年",for后面跟的是一段時間通常用于現(xiàn)在完成時態(tài),而且動詞要用延續(xù)性動詞,結(jié)構(gòu)為have/has+動詞過去分詞,故選C.

點評 本題考查了現(xiàn)在完成時的用法.解答時注意在for引導(dǎo)的時間短語中所使用的動詞應(yīng)該用延續(xù)性動詞.

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