Question

【题目】They were busy the project that they forgot the time.

A. too; discussing B. too; discuss

C. so; discussing D. so; to discuss

Answer 1

【答案】C

【解析】句意：他们如此忙于讨论那个项目以至于忘了时间。too+形容词/副词+to do sth“太……而不能做某事”，so+形容词+that 从句“如此……以至于……”，根据that they forgot the time 可知此处用so…that。根据be busy doing sth忙于做某事，故选C。