【題目】Many airlines now allow passengers to print their boarding passes online ______ their valuable time.
A.save
B.saving
C.to save
D.saved

【答案】C
【解析】現(xiàn)在很多航班允許乘客在線打印登機(jī)牌，以便節(jié)約他們寶貴的時(shí)間．句中Many airlines now allow passengers to print their boarding passes online是完整的句子結(jié)構(gòu)，后面要用非謂語(yǔ)動(dòng)詞；to save表示目的，要用動(dòng)詞不定式構(gòu)成目的狀語(yǔ)．故選C．

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