I would like to be a policeman,____who are in trouble.A.helps theseB.helping thoseC.help thoseD.helping one

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I would like to be a policeman,____who are in trouble.
A.helps these
B.helping those
C.help those
D.helping one

B,非谓语动词的运用,逗号之后且没有and等连接词连接,说明后面是非谓语动词形式,不能是动词原型,排除AC,再通过后面的定语从句中的谓语动词are判断,前面先行词应该是复数,因为定语从句的谓语动词和先行词一致,所以前面是those,而不能是one.

B.
后面的定语从句是复数。

B

B,现在分词表目的且从句BE动词为复数形式