问题
单项选择题
John promised his doctor he()not smoke,and he has not smoked ever since.
A. might
B. should
C. could
D. would
答案
参考答案：D
解析：
考查情态动词的用法。could是can的过去式，would是wiu的过去式，promised的宾语从句应该用过去将来时，故选择D。
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