题目内容
The children are having fun ________ on the playground.
| A．to play | B．play | C．playing | D．Played |
C
解析试题分析：句意：孩子们在操场上玩的很高兴的。Have fun（玩的高兴）后跟动词的ing，故选C。
考点：考查非谓语动词的用法
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