问题补充：
Mr．Jones was so late that his dinner got cold; his wife warm it up．
A. must
B. had to
C. ought to
D. might
答案：
A. must
(答案→)B. had to
C. ought to
D. might
解析：考查情态动词。must 必须，指主观上，had to 不得不，客观上，ought to应该，might 可能，句意：琼先生回来的如此的晚以至于饭都凉了；他的妻子不得不把它温热。所以选B。
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