Question

【题目】He wrote a letter to Mary yesterday.（用now改写句子）

He ________ ________a letter to Mary now.

Answer 1

【答案】is writing

【解析】

根据要求，可知此处要用现在进行时be doing；根据主语he为三单，可知be动词用is，动词write的现在分词为writing，故答案为is writing。