问题描述：
___,I should ask them some questions.A should they come to us B if they come to us
C were they come to us D had they come to us.这个题,选A是因为将来虚拟,如果C改成were they to come to us ,是不是也对?如果题干改成“I should have asked",那是不是选D?
C were they come to us D had they come to us.这个题,选A是因为将来虚拟,如果C改成were they to come to us ,是不是也对?如果题干改成“I should have asked",那是不是选D?
问题解答：
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