Question

【题目】They middle school students and they hard.

A. are all; work all B. are all; all work

C. all are; work all D. all are; all work

Answer 1

【答案】B

【解析】他们都是中学生并且他们都努力学习。all作副词经常位于系动词助动词情态动词之后，实意动词前。故选B。