单项选择题

Could you________ the baby while I go out shopping, please

A．best
B．see
C．watch
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单项选择题
When I got to the railway station, the train________.
A．left
B．had left
C．has left
单项选择题
The nurse is very tired, ________ she is still working very hard.
A．and
B．but
C．so
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