用賓語(yǔ)從句改寫(xiě)

When did the workers build the bridge? He asked.

He asked when the bridge ________ ________.

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科目：初中英語(yǔ) 來(lái)源：英語(yǔ)競(jìng)賽初三年級(jí) 題型：033

用賓語(yǔ)從句改寫(xiě)

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

I don't know ________ will return.

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