题目内容
Some policemen should be sent to _____ them _____ the trees.
A. prevent; to cut down B. stop; cutting down
C. keep; to cut down D. keep; cutting down
B
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题目内容
Some policemen should be sent to _____ them _____ the trees.
A. prevent; to cut down B. stop; cutting down
C. keep; to cut down D. keep; cutting down
B