单项选择题

I shall start the work ______ he comes. I don't know what to do first.

A． after
B． until
C． unless
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单项选择题
Tom is tall, ______ he isn't strong.
A． and
B． but
C． so
单项选择题
Tom and Jack' s father ______ in a car factory.
A． works
B． work
C． working
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