单选题 The children are having a good time,______ with sand, others with toys.
A. some of them playing B. who playing
C. some of whom are playing D. some of them

【正确答案】 A

【答案解析】[解析] 该题很容易误选C。从后面的．．．others with toys来看， “______with sand”应该与之并行，同为独立主格结构，并非是定语从句。答案为A。