单项选择题
A.am B.–（不填） C.had D.have
（）they are doing has never been done before.A. ThatB. W...
单项选择题（）they are doing has never been done before.
A. That B. What C. Why D. Whether
（）I enjoy most is（）I can have a holiday from work.A.Tha...
单项选择题（）I enjoy most is（）I can have a holiday from work.
A.That;that B.That;what C.What;what D.What;that
Before I got to the cinema, the film（）A.had begunB.has ...
单项选择题Before I got to the cinema, the film（）
A.had begun B.has begun C.is begun D.was beginning
