【()youknownthethetruth,youshouldhavetoldhimA:haveB:hadC:havingD:if】
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题目内容：
( )you known the the truth,you should have told him
A:have B:had C:having D:if
优质解答
B:had
假设句中,如果省略if,就要用“Were(Had/Should)+主语+...”的语序
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