Had it not been for the haze（霾）weather phenomenon, there         fewer car accidents in Beijing then．
A．would have beenB．were
C．may beD．would be
A

試題分析：考查虛擬語氣：句意：要不是因為霧霾天氣，那時北京的交通事故會更少，從Had it not been for the haze（霾）weather phenomenon,可知是和過去相反的虛擬條件句，相當(dāng)于：If it had not been for the haze（霾）weather phenomenon,所以主句也是和過去相反的虛擬語氣，用would have done，選A。
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