【題目】They have three tennis balls. (改為一般疑問句)
have three tennis balls?

【答案】Do；they
【解析】句意：他們有三個網(wǎng)球。他們有三個網(wǎng)球嗎？因為原句謂語動詞是實意動詞，主語是they, 所以變成一般疑問句，所以句首加助動詞do，所以答案是Do they。

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