【单选题】
Questions 18 to 20 are based on the following passage.At the end of the passage, you will be given 15 seconds to answer the questions. Now, listen to the passage. |
B.There was more garbage than before and they had to work harder.
C.The river had become so clean that a lot of water birds came back.
D.The river was much cleaner and they had to search for garbage.
网考网参考答案:D
网考网解析:
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