问题
选择题
-----What has made him upset recently?
-----_______ alone to face a troublesome milk case.
A．Left
B．Being left
C．Having left
D．To leave
答案
答案：B
考查动名词做主语。Being left alone to face a troublesome milk case实际上是句子的主语。句意：—最近什么事情让他难受？-被独自留下处理难办的牛奶案件让他难受。