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(shí)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(shí)間通常用于現(xiàn)在完成時(shí)態(tài)，而且動(dòng)詞要用延續(xù)性動(dòng)詞，結(jié)構(gòu)為have/has+動(dòng)詞過(guò)去分詞，故選C．

點(diǎn)評(píng) 本題考查了現(xiàn)在完成時(shí)的用法．解答時(shí)注意在for引導(dǎo)的時(shí)間短語(yǔ)中所使用的動(dòng)詞應(yīng)該用延續(xù)性動(dòng)詞．

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