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
答案:B
解析:
解析:
|
stop/prevent sb .(from)doing sth.阻止某人做某事,from可省略。 |
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