This book is really good. I’ll buy it it’s a little expensive.A. becauseB. althoughC. an

问题补充：

This book is really good. I’ll buy it, it’s a little expensive.

A. because

B. although

C. and

D. or

答案：

A. because

(答案→)B. although

C. and

D. or

解析：because因为；although虽然，尽管；and和，并且；or或者，否则。句意：这本书真的不错。我要买了它，尽管它有点贵。故选B。