Driving on the highway be very dangerous so you be too careful.A. should; ought to B. c

问题补充：

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

答案：

A. should; ought to

B. could; should

C. might; mustn’t

(答案→)D. can; can’t

解析：考查情态动词。在高速公路上驾车是很危险的，所以你越小心越好。Can’t … too..越……越……，选D。