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单项选择题

It"s half past four in the afternoon. The students are playing ______ basketball now.

A．.a
B．an
C．/

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热门试题

单项选择题______ of them has been to Beijing before.

A．Each
B．Both
C．An

单项选择题I have learned English ______ 5 years.

A．in
B．since
C．for