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Jumping out of _______ train running at a speed of 200 kilometers per hour is quite _____ dangerous practice.
A．/; theB．/; aC．a(chǎn); aD．the; the
C
前一空表示某一列火車，表示泛指，所以用a，第二空說，這是一次危險(xiǎn)的經(jīng)歷，所以也是用a。
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