—What made Jack so upset?— three tickets for the music concert.A. Lost B. LosingC. Becau

—What made Jack so upset?
— three tickets for the music concert.
A. Lost
B. Losing
C. Because of losing
D. Since

A. Lost (答案→)B. LosingC. Because of losing D. Since解析：此题考查非谓语形式。具体考查的是识别动名词短语作句子主语的能力。上句问“什么使杰克这么不安？” 答句是个省略句，完整的句子应为“Losing three tickets for the music concert made Jack so upset.” 选项A是过去分词，不可作主语；选项C、D连接的部分只能作状语。因此只能用动名词losing短语作主语。

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