单项选择题

He has lived alone ______ he was eighteen.

A．about
B．at
C．since
D．by
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单项选择题
It was this book ______ I bought the day before yesterday.
A．that
B．whom
C．which
D．who
单项选择题
The teaching building ______ for the whole summer.
A．will lock up
B．will have been locked up
C．will be locked up
D．will have locked up
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