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        1. 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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