题目内容
Some policemen should be sent to ________ them ________ the trees.
- A.prevented; to cut down
- B.stop; cutting down
- C.keep; to cut down
- D.keep; cutting down
B
prevent sb.(from)doing sth.中from可省略。排除A项。keep sb.from doing sth.中from不可省略。故C、D两项都排除,正确答案为B项。
prevent sb.(from)doing sth.中from可省略。排除A项。keep sb.from doing sth.中from不可省略。故C、D两项都排除,正确答案为B项。
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