问题补充：
I was told that there were about 50 foreign students Chinese in the school, most were from Germany.
A. study; of whom
B. study; of them
C. studying; of them
D. studying; of whom
答案：
A. study; of whom
B. study; of them
C. studying; of them
(答案→)D. studying; of whom
解析：第一空填现在分词，表示情况在进行; 第二空填of whom，是与most一起构成most of whom，用以引导定语从句，又如：I have a number of American relatives, most of whom live in Texas. I have a number of w Roman>我有一些美国亲戚，他们大都住在得克萨斯。
