Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .
A.must | B.mustn’t |
C.can | D.needn’t |
Be careful . You _______ cross the road when the traffic light is red . The traffic is heavy at this time of day .
A.must | B.mustn’t |
C.can | D.needn’t |