单项选择题

We must cherish experience______at the cost of blood.

A. enquired
B. inquired
C. acquired
D. required
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单项选择题
There was no sense______him to come early since everything was ready.
A. to ask
B. to have asked
C. in asking
D. being asking
单项选择题
Alone in a deserted house, he was so busy with his research work that he felt______lonely.
A. nothing but
B. anything but
C. all but
D. everything but
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