—How did he get my telephone number?—You it . You told him last weekA. should have forgo

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A. should have forgotten
(答案→)B. may have forgotten
C. must have forgotten
D. could have forgotten
解析：考查情态动词用法。本题考查了“情态动词+have done”的不同含义，这个结构可以表示对过去情况的推测，也可以表示虚拟语气。Should have done本应该做某事，实际上却未做；may have done也许做了某事；must have done一定做了某事；could have done本可以做某事，实际上却未做；句意：—他是怎么拿到我的电话号码的？—你也许忘记了，上个星期你告诉他的。故B正确。