单项选择题

It is unusual for there ______ so many tourists on the beach at this time of the year.

A．be
B．were
C．being
D．to be
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单项选择题
It is not until recently ______ there are many different kinds of hearing defects.
A．have the scientists discovered
B．the scientists have discovered
C．that the scientists have discovered
D．that will the scientist have discovered
单项选择题
Do you know how much the ______ family spends on food in the urban area
A．normal
B．general
C．usual
D．average
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