
His father is__( happy) to see him playing__( hap
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His father is happy to see him playing happily.
第一个空,前面是is,所以这里用形容词作表语,就填happy,意思是“他的父亲很高兴”。
第二个空,前面是playing,是个动词,所以后面要用副词形式,happily,意思是“他玩得很开心”。
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