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

– 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

A. They are(答案→)B. It isC. There areD. 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。

就是这个解释

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