--Do you want one way ________ round-trip?
--Round -trip. We'll return __________December 8th.
| A．or; in | B．and; in | C．or; on | D．and; on |
--Do you want one way ________ round-trip?
--Round -trip. We'll return __________December 8th.
| A．or; in | B．and; in | C．or; on | D．and; on |
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