Question

【题目】Look! The lights are still on. There________some students working hard on the coming exam.

A.must beB.can't beC.needn't be

Answer 1

【答案】A

【解析】

句意：看，灯仍然亮着，一定有学生在为要到来的考试努力学习。

考查情态动词。must必须，一定；can't不能，不可能；needn't不需要；根据The lights are still on灯仍然亮着，可推测一定有学生；故选A。