问题描述：
The film ___ for ten minutes when we got to the cinema.
A had already been on B had already begun
C have alreay been on D have already begun
为什么为A呢?
This book is worth ___.
A to read it B reading it C reading D to read
答案为C为什么类?
A had already been on B had already begun
C have alreay been on D have already begun
为什么为A呢?
This book is worth ___.
A to read it B reading it C reading D to read
答案为C为什么类?
问题解答：
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