问题

We _________be too careful while dealing with these social problems.

A:may not
B:cannot
C:needn’t
D:mustn’t;

正确答案是：

同类题型

pilot says he saw a UFO in the shape of triangle, moving very low over bushes two days ago.— ______, but I didn’t think that’s true.

Could you please clean the room— _____ I have to do my homework.

e changed his mind—Yes After some hours of discussion, I____ to talk him into accepting the new plan

Driving the halfway I _____ mycar was out of gas.

I’m sorry, I’m late.——_____________.