________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

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