His knowledge of language and trading________him a lot in his work.

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问题 His knowledge of language and trading________him a lot in his work.

选项 A、help
B、helps
C、was helpful
D、have helped

答案B

解析本句主语部分的中心词为knowledge(知识)，是不可数名词，所以其后的谓语动词应用单数形式。另外，本句中没有表示过去的时间状语，所以应用一般现在时。故选B。

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