单项选择题

There was nothing they could do ______.

A．but wait
B．except waiting
C．only to wait
D．unless they waited
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单项选择题
It is as difficult to persuade him not to smoke ______ to keep me from singing songs.
A．so is it
B．so it is
C．as it is
D．as is it
单项选择题
There is little ______ can be done about it.
A．which
B．what
C．where
D．that
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