—Shallwehaveasmokehere?—No,we

问题详情：

—Shall we have a smoke here?

—No, we _____ because this is gas station and the worker is carrying some petrol.

A. can’t          B. needn’t         C. mustn’t        D. won’t

【回答】

C

知识点：虚拟语气与情态动词

题型：选择题