Mr. Smith is in good health now for it is quite a long time since he ______.

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问题 Mr. Smith is in good health now for it is quite a long time since he ______.

选项 A、not smoked
B、smoked
C、has smoked
D、began to smoke

答案B

解析 since从句中所接的动词若是瞬间动词如join,catch,begin等则时间是从动作发生时算起,延续性动词如live,work,have则时间是从动作结束时算起。抽烟是延续性的行为习惯,故since he smoked意为“自从他戒烟”。整句话意为“史密斯先生现在身体不错,(是由于)他很久都没有吸烟了。”
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