You won't get good grades __________ you work hard.

A.and B.but C.unless D.if

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At the beginning of November 2018, the 35th Chinese Antarctic expedition（南極科考隊(duì)）set off for the polar（極地的）region. This time, one of their main tasks is to build China’s first permanent（永久的）Antarctic airport, Science and Technology Daily reported.

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In order to be environmentally friendly, the airport will be small, said Sun Bo, the leader of the research team. However, this doesn’t make it easy to build the airport.

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