________ me what you wanted to know, I should not have wasted my time talking so much with you.
A．Had you toldB．You have told
C．You had toldD．Have you told
A
A 考察虛擬語氣和特殊句式。句義：如果你早告訴我你想知道的事情，那么我就不會浪費時間和你說這么多了。由句義可知，這是對過去事情的虛擬，所以主句使用should have done，從句相應(yīng)地使用過去完成時。故A正確。
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