More money ____________ when we use both sides of paper.
A．will saveB．was savedC．has savedD．will be saved
考查動詞的時態(tài)和語態(tài)。紙的正反兩面都用的話，可以節(jié)省紙，當(dāng)然也省下了更多的錢。Money在句中做主語，需要使用被動語態(tài)，排除A、C選項。另外，此句是when引導(dǎo)的時態(tài)狀語從句，從句用了一般現(xiàn)在時，主句要用將來時，排除B。故選D。
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