When I am away ____ business, I contact my office every day by email.

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问题 When I am away ____ business, I contact my office every day by email.

选项 A、with
B、of
C、on
D、to

答案C

解析 本题考查介词词组on business。on business意为“出公差”,用于本题刚好符合上下文的意思。
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