作者aphroditeyeh (新的开始)
看板Eng-Class
标题[请益] cloze
时间Sun Dec 19 15:01:08 2010
Due to shootings that occurred at Virginia Tech, a lot of attention has been paid to the issue of gun laws.
Could stronger gun laws______ this tragedy?
Nobody can say for sure.
(A) prevent
(B) have prevented
(C) be preventing
(D) have been prevented
答案是B
请问为何A C 不行呢?
谢谢您
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1F：→ cita:因为这个trageday事实上已经发生，假设语气要用过去完成式 12/19 15:34
2F：→ cita:表示"与过去事实相反" 12/19 15:35
3F：→ aphroditeyeh:thanks a lot! 12/19 15:36