单选题：._______ there is going to be a policy change ________ of t..

We didn't have enough chairs, _____ some of the students had to sit on the floor. [ ]A. or B. as C. so D. but

短文改错 Recently, my classmates have had a heated discussion about if we should have optional courses(选修课) in high schools. Some students werein favor of optional courses. They say interest is bestteacher andour spare time will be colorful and meaningful. St

They will come to help us with the harvest ______ they are busy tomorrow. [ ]A. even ifB. howeverC. as thoughD. even although

All the books in the list, _____otherwise stated, will be available.[ ]A. asB. ifC. althoughD. unless

Believe it or not, there is __________ as standard English. [ ]A. no such a thing B. no suchthingC. not such thingsD. no such things