单项选择题

______ you call me to say you're not coming, I'll see you at the theatre.

A．Though
B．Whether
C．Until
D．Unless
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单项选择题
I have spent a lot more time studying English than Li Ping ______.
A．have
B．has
C．does
D．did
单项选择题
The coat is worth ______.
A．buying
B．having bought
C．being bought
D．to be bought
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