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【单选题】

No one but you knows your heart is racing, so take a breath and try to ________ down.
[]

A.
concern
B.
set
C.
upset
D.
calm
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参考答案:
参考解析:
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举一反三

【单选题】Madame Curie is believed _______ radium.

A.
discovering
B.
having discovered
C.
to have discovered
D.
to discover