单项选择题

The ability to use a language can be（）only by the act of using the language.

A. acquitted
B. acquired
C. inquired
D. required

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单项选择题

What do you（）to do about the problem now that this solution has failed

A. avoid
B. think
C. pretend
D. intend

单项选择题

The number of the people,（）we had expected, was a thousand.

A. whom
B. who
C. as
D. that

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