单选题
______ no gravity, there would be no air around the earth, hence no life.
A、
If there was
B、
If there had been
C、
Were there
D、
Had there been
【正确答案】
C
【答案解析】
[解析] 本题为虚拟语气考点。首先要注意条件句和主语的时态对应关系，再考虑条件句中省略“If”的规则为助动词与主语倒装。只有C项符合本句语法要求。A项中的“was”一词有误；B项和D项用法完全一致，所以都不能选。
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