---I have great difficulty working out this problem.--- ______ to me, you ______ less difficulty with such problems now.A.If you had listened; would have hadB.If you listened; would haveC.Had you listened; would haveD.If you listen; will have
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C解析答语中的时间状语各不相同；从句中是过去时，主句中是现在时，因此用虚拟语气时，从句中用had done，主句中用“情态动词+do”，即had listened与would have。本句还涉及省略：If you had listened to me=Had you listened to me。