单项选择题

You can take anything from the shelf and read, but please （） the books when you've finished with them.

A. put on
B. put down
C. put back
D. put off

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单项选择题
When（）with a strong enemy, they had always retreated.

A. being faced
B. facing
C. faced
D. being facing
单项选择题
The committee （） the problem for a whole afternoon but they have not yet reached an agreement.

A. has discussed
B. has been discussing
C. are discussing
D. have been discussing
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