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—The year 2020 is ________ unusual one. A new kind of virus is spreading around the world. —The figh...
题目内容：
—The year 2020 is ________ unusual one. A new kind of virus is spreading around the world.
—The fight against the virus is like ________ race against time.
A.a, the B.an, the C.an, a D.a, an
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