【題目】Before you ask someone for help, find out _________ he is the right person for your problem.

A.sinceB.whetherC.unless

【答案】B

【解析】

句意：在你向某人求助前，弄清楚他是否是幫你解決問題的合適人選。

考查賓語從句的引導(dǎo)詞辨析。since自從；whether是否；unless除非。根據(jù)句子結(jié)構(gòu)，空格處所在句子是一個賓語從句。根據(jù)Before you ask someone for help“在你向某人求助前”及find out“弄清楚”，可知，是要先弄清楚某人是否能幫你解決問題，再去求助他，所以空格處填whether。故選B。

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