单项选择题

We live in a time_________, more than ever before in history, people are moving

A．what
B．when
C．which
D．where
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单项选择题
We have a desperate need________ practice strict economy in every department.
A．to
B．of
C．for
D．about
单项选择题
_________at Harvard, he began to write his essay.
A．Busy was as he
B．Busy as was he
C．Busy as he was
D．As was he busy
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