题目内容


Be careful    _   too fast, or there    _   be an accident.
A．not to drive; mustB．to not drive; may
C．not drive; mustD．not to drive; may
D

试题分析：本题的含义是当心开车不要开得太快，否则可能会发生交通事故。Be careful not to do表示当心不要做某事的意思，动词不定式的否定形式在to do前加not，may表示可能性或许的意思，故本题选D。
点评：在英文中，应注意动词不定式也有否定形式，结构为not to do sth，同时也应该注意情态动词may表示可能性，后跟动词原形。
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