-------What do you suppose made him so unhappy?

------- ________ his wallet.

A. Losing B. Lost C. lose D. To lose

A

【解析】

試題分析：考查非謂語(yǔ)動(dòng)詞 。句意：你認(rèn)為什么讓他不高興？丟錢包了。What在句子中做主語(yǔ)，只有動(dòng)名詞可做主語(yǔ)，故選A項(xiàng)。

考點(diǎn) : 考查非謂語(yǔ)動(dòng)詞

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