题目内容

-–Mary knows the city quite well.
--She______ well have been there before.
A．needB．couldC．should D．may
D

试题分析：考查情态动词：A. need 需要B. could 能够C. should应该D. may可以，几个选项只有may可以用may well do sth的意思是“有足够/充分的理由去做某事”。 句意：玛丽很了解这个城市。--她很有可能去过那里。选D。
点评：情态动词要记住基本含义，还有情态动词的多种含义，象could表示：能够，也可以表示客观上有可能。May还可以构成词组：may as well do sth不妨做…,may well“有足够/充分的理由去做某事”，如： You may well not accept his apology.你有足够/充分的理由不接受他的道歉。
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