19．The driver could have survived，but he ____ the seat belt．（　�。�
A．had been fasteningB．hadn't fastened
C．was fasteningD．didn't fasten

分析 司機本可以幸存下來的，但是他沒有系安全帶．

解答 答案：D，考查否定句，由謂語could have survived"本可以存活下來"可知描述的是"司機過去沒有系安全帶"，故時態(tài)用一般過去時，答案為D，A選項是過去完成進行時，表示過去開始動作一直在持續(xù)，B選項是過去完成時，表示過去以前就發(fā)生的動作，C選項是過去進行時表示過去某一時刻正在發(fā)生的動作，均不符合題意．

點評 考查否定句，要結(jié)合語境對句子成分進行分析．

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