→ cita:因為這個trageday事實上已經發生，假設語氣要用過去完成式 12/19 15:34
→ cita:表示"與過去事實相反" 12/19 15:35
→ aphroditeyeh:thanks a lot! 12/19 15:36
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
請問為何A C 不行呢?
謝謝您
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