问题
选择题
________ me what you wanted to know, I should not have wasted my time talking so much with you.
A．Had you told
B．You have told
C．You had told
D．Have you told
答案
答案：A
A 考察虚拟语气和特殊句式。句义：如果你早告诉我你想知道的事情，那么我就不会浪费时间和你说这么多了。由句义可知，这是对过去事情的虚拟，所以主句使用should have done，从句相应地使用过去完成时。故A正确。