单项选择题

Both his brother and his sister ______ busy with their homework.

A．is
B．are
C．am
D．be
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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
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
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