单项选择题

The nurse is very fired, ______ she is still working very hard.

A．and
B．but
C．so
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The Johnsons have been on holiday ______ the end of June.
A．since
B．for
C．at
单项选择题
Could you ______ the baby while I go out shopping, please
A．look at
B．see
C．watch
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