– Who are playing football in the gym now? – the students from No. 1 Middle School.A. The

问题补充：

– Who are playing football in the gym now?

– the students from No. 1 Middle School.

A. They are

B. It is

C. There are

D. That is

答案：

A. They are

(答案→)B. It is

C. There are

D. That is

解析：考查强调句型。本题第二句后面省略了who/that are playing football in the gym now.句意：—在体育馆里踢球的是谁啊？—是来自一中的学生在里面踢球。故B正确。