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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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