单项选择题

What are they doing

A．They are talking in the garden.
B．They are making a telephone call.
C．They are having lessons.
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A．They have caught the early train.B．They are waiting for a train.C．They have missed the early train.
A．They have caught the early train.
B．They are waiting for a train.
C．They have missed the early train.
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