The supervisors could have prevented this problem______about it beforehand.A、if

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问题 The supervisors could have prevented this problem______about it beforehand.

选项 A、if they knew
B、had they known
C、if had they known
D、if they would know

答案 B

解析如果if条件句中含有were，should，had等词，可以省去if，并把were，should，had 移到从句首，意思不变。

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