2. 外语
  3. Each worker puts in nearly 2,200 hours a year, ______ average, and contributes about $ 30 to GDP per hour.

Each worker puts in nearly 2,200 hours a year, ______ average, and contributes about $ 30 to GDP per hour.

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问题 Each worker puts in nearly 2,200 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 本题考查固定搭配on average的用法，意为“平均”，故本题答案为C)。
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