—The Mars-500 test will take about 520 days.
—__________ I hope it goes well.
| A．It’s a pleasure. | B．Good luck! | C．That’s OK. | D．Congratulations! |
—The Mars-500 test will take about 520 days.
—__________ I hope it goes well.
| A．It’s a pleasure. | B．Good luck! | C．That’s OK. | D．Congratulations! |
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