save water还是saving water?_____water.(节约用水)_____the room clean.(保持)用不用+ING?是句子的哦。是Saving or save?

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save water还是saving water?_____water.(节约用水)_____the room clean.(保持)用不用+ING?是句子的哦。是Saving or save?
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save water还是saving water?_____water.(节约用水)_____the room clean.(保持)用不用+ING?是句子的哦。是Saving or save?
save water还是saving water?
_____water.(节约用水)
_____the room clean.(保持)
用不用+ING?
是句子的哦。
是Saving or save?

save water还是saving water?_____water.(节约用水)_____the room clean.(保持)用不用+ING?是句子的哦。是Saving or save?
不用ing,直接用原形.
save water
keep the room clean

要根据语境8~

saving water
keep the room clean

save water````
keep``````

直接用原形