2. 外语
  3. According to United States Coast Guard requirements, life preservers must be simple in design, reversible, capable of be quickly

According to United States Coast Guard requirements, life preservers must be simple in design, reversible, capable of be quickly

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问题 According to United States Coast Guard requirements, life preservers must be simple in design, reversible, capable of be quickly adjusted to fit the uninitiated individual, and must be so designed as to support the wearer in the water in an upright or slightly backward position.
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答案动词形式错误，应把capable of后面的be改为being
解析 因为介词of后面需跟名词或动名词。
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