______ with air, a life jacket will keep a person afloat.A、It is filledB、Fillin

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问题 ______ with air, a life jacket will keep a person afloat.

选项 A、It is filled
B、Filling
C、When filled
D、When filling it

答案 C

解析从属分句省略主语时，其逻辑主语应与主句主语一致，本句的主语应该是a life jacket，所以应选择表被动的filled。

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