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The supervisors could have prevented this problem______about it beforehand.A、if
The supervisors could have prevented this problem______about it beforehand.A、if
游客
2025-03-27
19
管理
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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