题目内容
() 4. Many rivers these years.
A. have became polluted
B. have been polluted
C. has been polluting
D. has become polluting
4. B
4. B表示“许多河流已经被污染”应用现在完 成时的被动语态:have/hasbeen+动词的过 去分词。
练习册系列答案
相关题目
题目内容
() 4. Many rivers these years.
A. have became polluted
B. have been polluted
C. has been polluting
D. has become polluting
4. B表示“许多河流已经被污染”应用现在完 成时的被动语态:have/hasbeen+动词的过 去分词。