题目内容
You ________ be too careful when crossing the busy street.
A.can
B.cannot
C.must
D.mustn't
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短文改错(共10小题;每小题1分,满分10分)
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Driving on the highway ______ be very dangerous, so you ______ be too careful.
| A.should; ought to | B.could; should | C.might; mustn’t | D.can; can’t |