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