The train is running ______120 kilometres an hour.
A．a(chǎn)t a speedB．a(chǎn)t the speedC．a(chǎn)t a speed ofD．on a speed of
C

試題分析：考查固定搭配。句意：那輛火車以每小時(shí)120公里的速度行駛。at“以，按照......”，at a speed of以......的速度。故選C。
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