单项选择题

While_______ in London, the young engineer picked up some English.

A．slaving
B．stay
C．stayed
D．to stay
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单项选择题
He bought an expensive coat ______he had no job.
A．although
B．since
C．unless
D．till
单项选择题
He suggested _________the weekend with some foreign friends.
A．spend
B．spending
C．to spend
D．spent
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