Manyairlinesnowallowpassengerstoprinttheirboardingpasse...

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Many airlines now allow passengers to print their boarding passes online ______ their valuable time.

A. save B. saving C. to save D. saved

【解析】考查非谓语动词。句意：许多航空公司现在允许乘客网上打印他们的登机牌来节省时间。动词不定式表目的，选C。