19．我正忙著制作圣誕賀卡呢！
I'm busy making the Christmas cards．

分析 I'm busy making．

解答 答案：I'm busy making．
表示客觀事實(shí)用一般現(xiàn)在時(shí)，忙于做某事be busy doing sth，主語I，故am，make制作，故答案是I'm busy making．

點(diǎn)評(píng) be busy doing sth側(cè)重于動(dòng)作 sth 是名詞哦•do是動(dòng)詞的形式
be busy with sth 側(cè)重于狀態(tài)
意思都一樣，可以互換．
He is busy doing homework．
He is busy with homework．

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