His health ______, my uncle had to leave the air force in 1948.A、failedB、was fa

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问题 His health ______, my uncle had to leave the air force in 1948.

选项 A、failed
B、was failed
C、fairing
D、had failed

答案 C

解析此句为独立主格结构。该句没有任何连词，所以前半句必须采用非谓语动词结构。

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