If you _____ him yesterday, you _____ what to do now.
A．a(chǎn)sked … would knowB．had asked … would have known
C．a(chǎn)sked him … knowD．had asked … would know
D
本題考查虛擬語(yǔ)氣。從句與過(guò)去事實(shí)相反用had done，主句與現(xiàn)在事實(shí)相反用would do。句意：如果你昨天問(wèn)他，你現(xiàn)在就會(huì)知道發(fā)生了什么。
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