—What made Jack so upset?
—__________three tickets for the music concert.
A.Lost
B.Losing
C.Because of losing
D.Since
—What made Jack so upset?
—__________three tickets for the music concert.
A.Lost
B.Losing
C.Because of losing
D.Since
B
本题考查识别动名词短语作主语的能力。上句问“什么事使杰克这么难过？”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.”A项是过去分词，不可作主语；C、D两项连接的部分只能作状语。因此只能用动名词losing短语作主语。