单项选择题

I hope all the precautions against air pollution, ______ are suggested by the local government, will be seriously considered here.

A. as
B. while
C. after
D. since
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单项选择题
The ______ were obliged to sweep away the tree ______ from the ______.
A. serfs.., leaves.., roofs
B. serves.., leafs.., roofs
C. serfs.., leaves.., moves
D. serfs.., leaves.., roofs
单项选择题
Those who ______ will burn themselves.
A. play a fire
B. play fire
C. play the fire
D. play with fire
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