—What has made him upset recently?
— alone to face a troublesome milk case.
A. Left
B. Being left
C. Having left
D. To leave
网友回答
A. Left
B. Being left
C. Having left
D. To leave
解析: 考查非谓语动词。这句话是一个省略句,答语部分其实是句子的主语,这句话完整的形式是:Being left alone to face a troublesome milk case has made him upset recently.。