题目内容
Mr. Smith is in good health now for it is quite a long time since he __________.A. not smoked B. gave up smoking
C. has smoked D. began to smoke
答案:B
提示:
提示:
在since从句中瞬间性动词如join, catch是动作从发生时算起;延续性动词如live, work, have是动作从结束时算起。抽烟是延续性的行为习惯,故since he gave up smoking意为“自从他戒烟”。
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