His knowledge of language and international business________ him in his work.

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问题 His knowledge of language and international business________ him in his work.

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

答案B

解析本句的主语为knowledge，为不可数名词，其后谓语动词应用单数形式。句中没有明显的表示过去的时间状语，所以不能用一般过去时，可排除C项。结合句意可知，此处是在陈述客观事实，所以应用一般现在时。故选B。

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