单项选择题

Don’t ______ your clothes.

A. dirty

B. dirtied
C. dirtying
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单项选择题
We have to learn ______ technology from other countries.
A. advance

B. advancing
C. advanced
单项选择题
No one should enter the spot without the ______ of the police.
A. permit

B. permission
C. permitting
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