John promised his doctor he ________ not smoke, and he has smoked ever since.
A．mightB．shouldC．couldD．would.
D
本題考查的情態(tài)動詞的用法，特別是 could 和would 的意義區(qū)別。 Could, can 的過去式，主要表示“能夠，可以，推測”等意義，而would 表示“將，愿意”，根據(jù)題干的意義（約翰向醫(yī)生許諾將不吸煙，而且從那以后就沒有再吸煙。），故選擇D。
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