单项选择题

— Do you always go to work on foot
— Not always.______ it rains, I usually go to work by bus.

A．When
B．While
C．As
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单项选择题
The subway train starts and stops quickly. It helps the train______ swiftly between the stations.
A．go
B．going
C．to go
单项选择题
Not only he but also I______ good at singing.
A．is
B．am
C．are
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