Q:Why is it getting warmer and warmer these years?A:It's saidQ:Why is it getting warmer and warmer these years?A:It's said that's greenhouse effect .Scientists
网友回答
have been studying; haven't solved
stopswas; had run
不明白的再问哟,请及时采纳,多谢!
======以下答案可供参考======
供参考答案1:
are studying haven't solved stops was has wun
供参考答案2:
have been studying
have not solved
has stopped
was was running