【题目】Mrs. Brown really ____ go on a diet. She has put on so much weight since she gave up jogging.

A. couldB. ought to

C. mayD. must

【答案】B

【解析】

考查情态动词词义辨析。句意：布朗太太真的应该节食了。自从她放弃慢跑后，体重增加了很多。A. could能够；B. ought to应该；C. may也许；D. must必须。情态动词ought to指建议或劝告某人“应该”做某事。故选B。

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