16．Look，so many people are running out of the station．I wonder what ________．（　　）
A．is happenedB．was happeningC．is happeningD．had happened

分析 看，這么多的人正從火車站跑出來，我想知道正在發(fā)生什么事．

解答 答案：C 根據(jù)對于關(guān)鍵句的理解Look，so many people are running out of the station．（看，這么多的人正從火車站跑出來）可知，后面的這句話應(yīng)是強調(diào)正在發(fā)生的事，所以應(yīng)該用現(xiàn)在進行時，其結(jié)構(gòu)為be+動詞的現(xiàn)在分詞．發(fā)生的事應(yīng)為單數(shù)概念，所以應(yīng)該用系動詞的單數(shù)形式is，再加happen的現(xiàn)在分詞happening．故選C．

點評 此題考查現(xiàn)在進行時的用法．做題時一定要抓住句子的關(guān)鍵詞并聯(lián)系前后句的語境去理解整個句子，從而確定用何種時態(tài)．尤其是現(xiàn)在進行時，be動詞和現(xiàn)在分詞缺一不可，不要漏掉任何一個．另外要注意其變化形式，避免出錯．

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