polluting the water 是件事,可用what 代替
stop 后加 doing 表停止做某事
所以
what must we stop doing?
We must stop polluting the water.(划线部分提问)__must we stop____?划线部分是polluting the water
We must stop polluting the water.(划线部分提问)__must we stop____?划线部分是polluting the water
We must stop polluting the water.(划线部分提问)
____must we stop____?划线部分是polluting the water
We must stop polluting the water.(划线部分提问)
____must we stop____?划线部分是polluting the water
英语人气：428 ℃时间：2019-08-20 00:10:03
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