17.-- What do you suppose made him look so unhappy?-- --- his wallet.A.Lose B.Lost C.Losing D.Because of losing 请详解此句型相关语法,选详解的正确答案为最佳答案.

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17.-- What do you suppose made him look so unhappy?-- --- his wallet.A.Lose B.Lost C.Losing D.Because of losing 请详解此句型相关语法,选详解的正确答案为最佳答案.

17.-- What do you suppose made him look so unhappy?-- --- his wallet.A.Lose B.Lost C.Losing D.Because of losing 请详解此句型相关语法,选详解的正确答案为最佳答案.
17.-- What do you suppose made him look so unhappy?
-- --- his wallet.
A.Lose B.Lost C.Losing D.Because of losing
请详解此句型相关语法,选详解的正确答案为最佳答案.

17.-- What do you suppose made him look so unhappy?-- --- his wallet.A.Lose B.Lost C.Losing D.Because of losing 请详解此句型相关语法,选详解的正确答案为最佳答案.
C
这是省略句,要领是把句子补全
因为丢了钱包,使她感到难过
losing his wallet made him look so happy
你要把后面的补全,就不难看出,这是动名词做主语

-- What do you suppose made him look so unhappy?你觉得/认为是什么事情使他看上去很郁闷?
-- Losing his wallet.丢了钱包。
由于问句用的是what,指的是“什么事情”,所以回答应该是名词性(包括动名词)短语。