________you were coming，I would have stayed at home.

A．If I knowB．Should I knowC．Had I knownD. If I should have known

 

C

【解析】

試題分析：句意：我要是知道你要來(lái)，我就呆在家里了。根據(jù)I would have stayed at home.可知是和過(guò)去相反的虛擬語(yǔ)氣，從句用過(guò)去完成時(shí)，這里可以省略if，將had提前，所以選C。

考點(diǎn)：考查虛擬語(yǔ)氣的省略倒裝

 

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