Please think of different ways of_water A.to saveB.savingC.saveing选什麼

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Please think of different ways of_water A.to saveB.savingC.saveing选什麼

Please think of different ways of_water A.to saveB.savingC.saveing选什麼
Please think of different ways of_water A.to saveB.savingC.saveing选什麼

Please think of different ways of_water A.to saveB.savingC.saveing选什麼
B of 是介词 后加动词ing
save的ing 要去e
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B.saving动名词

B.saving 介词后的动词用动名词v-ing