ZhangFang’sparentsarebothteachers.Theyarealwaysbusy
问题详情：
Zhang Fang’s parents are both teachers. They are always busy ________ into deep night.
A. work B. working C. worked D. to work
【回答】
B
知识点：动词和动词短语
题型：选择题
问题详情：
Zhang Fang’s parents are both teachers. They are always busy ________ into deep night.
A. work B. working C. worked D. to work
【回答】
B
知识点：动词和动词短语
题型：选择题
