Driving in rush hour traffic ______ be very dangerous, so you _____ be too careless.
| A．should; ought to | B．could; should |
| C．might; mustn’t | D．can; can’t |
Driving in rush hour traffic ______ be very dangerous, so you _____ be too careless.
| A．should; ought to | B．could; should |
| C．might; mustn’t | D．can; can’t |
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