题目内容
() 4. — Many trees last year. — Yes,we must do something to stop people from doing it.
A. are cut down B. have cut down
C. were cutting down D. were cut down
4.D
4.D
练习册系列答案
相关题目
题目内容
() 4. — Many trees last year. — Yes,we must do something to stop people from doing it.
A. are cut down B. have cut down
C. were cutting down D. were cut down
4.D