题目内容


John promised his doctor he ________ not smoke, and he has smoked ever since.
A．mightB．shouldC．couldD．Would.
D
考查情态动词的用法，特别是 could 和would 的意义区别。 Could, can 的过去式，主要表示“能够，可以，推测”等意义，而would 表示“将，愿意”，根据题干的意义（约翰向医生许诺将不吸烟，而且从那以后就没有再吸烟。），故选择D。
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