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  3. Each worker puts in nearly 2200 hours a year______average, and contributes about $30 to GDP per hour.

Each worker puts in nearly 2200 hours a year______average, and contributes about $30 to GDP per hour.

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问题 Each worker puts in nearly 2200 hours a year______average, and contributes about $30 to GDP per hour.
选项 A、with
B、in
C、on
D、under
答案C
解析 on average为固定搭配，意为“平均”。故选C。
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