单项选择题

Father advised me not to say anything until ______ at the meeting.

A. asking
B. to ask
C. asked
D. ask
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单项选择题
______ these ancient buildings in this city are!
A．What perfectly protected
B．How perfect protected
C．How perfectly protected
D．What perfect protected
单项选择题
You may take them all home ______．
A. if possible
B. if can
C. unless so
D. even if you can
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