单项选择题

Setting up a committee might be a way ______ the project more efficiently.

A. to be doing
B. doing
C. to do
D. being done
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单项选择题
Can you make sure ______ the gold ring
A. where Alice bad put
B. where did Alice put
C. where Alice has put
D. where has Alice put
单项选择题
By cutting down trees we ______ the natural home of birds and animals.
A. harm
B. hurt
C. injure
D. damage
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