单句改错。

1. my name is betty and i'm from america.

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2. these are my friends.

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3. she can't play basketball.

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4. She is american and she's a secretary in china.

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5. these american teachers can speak chinese.

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桥吊司机因预警大风撤离机械前，应检查（）是否到位。

A、地锚

B、八爪、拉杆

C、防爬楔

D、以上都是