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The children are having fun ________ on the playground.

A．to play B．play C．playing D．played

C

【解析】

試題分析：句意：孩子們正大操場上開心地玩耍著。分析：考查固定短語 have fun doing sth.開心做某事。因此選用動(dòng)詞現(xiàn)在分詞形式。故選C

考點(diǎn)：考查非謂語動(dòng)詞。

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