问题描述：
虚拟语气的一道题,希望能给出答案并且解释
If they ____ earlier,they ____ here now.
A.had started,would be
B.started,might be
C.had started,would have been
D.will start,might have been
If they ____ earlier,they ____ here now.
A.had started,would be
B.started,might be
C.had started,would have been
D.will start,might have been
问题解答：
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