用賓語從句改寫

When will Tom's mother return? I don't know.

I don't know ________ will return.

答案：
解析：

when Tom's mother


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科目：初中英語 來源：英語競賽初三年級 題型：033

用賓語從句改寫

When did the workers build the bridge? He asked.

He asked when the bridge ________ ________.

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