问题
选择题
The children are having a good time, ______ with sand, others with toys．
A．some of them playing
B．some of them are playing
C．some of them
D．who playing
答案
答案：A
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The children are having a good time, ______ with sand, others with toys．
A．some of them playing
B．some of them are playing
C．some of them
D．who playing
答案：A