一道填词题,搞不懂But,you know,there are still some students,most of

回答;这是一个复合句,从句是带介词短语的非限定性的定语从句,空格处应用关系代词whom,而不能用人称代词them.但如果这个句子的两部分有并列连词,就是并列句,这时,空格处就可以用人称代词them.如：
But you know, there are still some students, and most of them are boys of science, learning English with much trouble.
又如：
The couple have two sons, one of whom is a doctor.
The couple have two sons, and one of them is a doctor.
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这应该是定语从句，所以就是用whom