作业帮the rivers will become dirtier and dirtier --- we take action to protect thema\ sinceb\ ifc\ untild\ unless说理由!
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the rivers will become dirtier and dirtier --- we take action to protect thema\ sinceb\ ifc\ untild\ unless说理由!
the rivers will become dirtier and dirtier --- we take action to protect them
a\ since
b\ if
c\ until
d\ unless
说理由!
the rivers will become dirtier and dirtier --- we take action to protect thema\ sinceb\ ifc\ untild\ unless说理由!
D
河水会越来越脏,除非我们采取措施保护他们
D 除非我们采取行动去保护它否则河会越来越脏
除非我们采取措施保护他们