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

A.and B.but C.unless D.if

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The manager of the hotel looks ________ and he smiles all the time.

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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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