单项选择题

Who will look ______ the baby while we're out

A．after
B．at
C．for
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单项选择题
Betty's parents have lived in this city ______ five years.
A．for
B．since
C．in
单项选择题
The old man turned on the radio ______ listened to it.
A．but
B．and
C．or
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