题目内容

China is a ____ country.

A. developing
B. develop
C. developed
D. being developed

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Things keep ____.

A. changed
B. changing
C. being changed
D. change

Poor Bill can’t help ____.

A. coughing
B. to cough
C. that he coughed
D. cough

She enjoys ____ to light music.

A. on listen
B. to listening
C. listening
D. listened

按照集中落差形成水头的措施，水能资源开发一般分为坝式、（）和混合式三种基本方式。

A. 抽水蓄能
B. 潮汐式
C. 引水式
D. 径流式