题目内容
根据所给词的适当形式填空。
I often heard him ________ (sing) in the room. now I see him ________ (play) on the ground.
答案:singing;playing
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题目内容
根据所给词的适当形式填空。
I often heard him ________ (sing) in the room. now I see him ________ (play) on the ground.