(单选题)

While football on the playground, I found my keys .

A.playing; lost

B.play; losing

C.played; being lost

D.having played; lost

参考答案：A

参考解析：

考查状语从句的省略和过去分词作宾语补足语。句意：当我在操场上踢足球的时候，我发现我的钥匙丢了。状语从句的主语和主句的主语一致且谓语是系动词时，可省略主语和谓语，这里用过去进行时was playing，表示“正在踢球的时候”，故第一空省略主语谓语后，填playing；第二空的钥匙和丢之间是被动的关系，因此选择lost，过去分词表被动。故选A。

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While ______ football on the playground, I found my keys ______.

While football on the playground, I found my keys .