题干
They enjoyed_____ storybooks very much last year.
A：to read
B：read
C：reading
D：do reading
答案(点此获取答案解析）
C
They enjoyed_____ storybooks very much last year.
A：to read
B：read
C：reading
D：do reading
是方程
的根, 
是方程
的根，则
的值为（ ）
