It will be a great advantage to be able to speak a foreign language, especially if you are ______ business.

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问题 It will be a great advantage to be able to speak a foreign language, especially if you are ______ business.

选项 A、to
B、with
C、on
D、in

答案D

解析 能讲一种外语是十分有优势的,特别是在做生意的时候。本题测试介词的用法。in表示“从事……职业”“经商”;on business是固定短语,意为“因公,因事”。
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