Theboykepton________whenhisfather

发布时间：2020-07-11 00:14:32

The boy kept on ________ when his father came in.













A.to write












B.sitting in a chair











C.lying in bed











D.singing the song

网友回答

D解析keep on后接动词 - ing形式，且不表示静态，故B，C排除。
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