If you______to Mr. Smith more carefully, you could work out the problem without any difficulty now.

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问题 If you______to Mr. Smith more carefully, you could work out the problem without any difficulty now.

选项 A、listened
B、listen
C、had listened
D、have listened

答案C

解析 本题考查虚拟语气。句意为“如果你更细心地听史密斯先生讲,你现在就可以毫无困难地解决这个问题了”。题中的句子为错综时间条件句,从句与过去事实相反,主句与现在事实相反,所以从句要用had+过去分词。故本题选C。
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