—I’ll call Bob and tell him the good news.
—You do that. He was here just now and heard it.
A. couldn’t
B. mustn’t
C. shouldn’t
D. needn’t
网友回答
A. couldn’t
B. mustn’t
C. shouldn’t
(答案→)D. needn’t
解析：考查情态动词。A. couldn’t不可能；B. mustn’t禁止；C. shouldn’t不应当；D. needn’t不必。句意：——我会打电话给Bob告诉他好消息。——你不必那么做。他刚才在这里已经听说过了。故D正确。