单项选择题

There is hardly any ______ hotel room available during the summer holidays.

A．vacant
B．empty
C．free
D．blank
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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
My wife couldn't sleep last night because the tap in the bathroom was ______
A．draining
B．dropping
C．spilling
D．dripping
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