单项选择题

So many representatives______, the conference had to be put off.

A．were absent
B．to be absent
C．being absent
D．had been absent
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单项选择题
The old people often raise______for the sake of companionship.
A．pets
B．pipes
C．pills
D．pies
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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