问题补充：
Look, a group of students are playing the violin there, their teacher as the conductor.
A. in front of them stand
B. in front of them stands
C. in front of whom standing
D. in front of whom stands
答案：
A. in front of them stand
B. in front of them stands
C. in front of whom standing
(答案→)D. in front of whom stands
解析：D本题考查倒装句。句意：看，有一群学生在那里拉小提琴，他们的老师站在前面当指挥。表方位的介词短语置于句首时，应用全部倒装，其谓语动词应与后面的主语一致。逗号后应是定语从句，应用关系代词whom。
