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 |
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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 |
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