单项选择题

______ you park your car in the marked parking lot, you will be fined.

A．Until
B．If not
C．Provided that
D．Unless
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单项选择题
They have done nothing for the coming Christmas, ______.
A．we have either
B．so have we nothing
C．neither have we
D．nor have we noting
单项选择题
They visited the internationally famous mountain, ______ their stay in Africa.
A．in
B．during
C．within
D．to
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