单项选择题

The three children looked after their sick mother ______.

A．in return
B．by turn
C．in turn
D．on turn

相关考题

She is always the first ______ to school.A．comingB．to c...

单项选择题She is always the first ______ to school.

A．coming
B．to come
C．to have come
D．having come

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