第一个填doing.这是个固定搭配.be busy (in)doing sth.
第二个填does.often是“经常”的意思,在这个句子里是一般现在时的标志,所以要用一般现在时的形式does.
swim是动词的原形,而swimming 是现在分词形式.
用词的正确形式填空1.She is very busy _____ (do)her homework.2.My frie
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