不定冠词用于人名或星期几之前,表示说话者对所谈及的人或时间不大有把握,不知道到底是谁或哪个星期几。此时的不定冠词相当于one或a certain。
20. -- Can I speak to Mr. Green ?
-- Sorry . There isn’t ______ Mr. Smith here
A. / B. a C. the D. an
21. 【2005山东】I know _____ John Lennon, but not _____ famous one .
A. /; a B. a; the C. /; the D. the; a
22. 【2005 湖南】 I can’t remember when exactly the Robinsons left_____ city. I only remember it was _____ Monday .
A. The; the B. a; the C. a; a D. the; a
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