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17、The new D-type trains can run at speeds (速度)of 200 to 250 kilometres       hour.The trip from Shanghai to Beijing only takes lo hours now.

A.a                         B.an                       C.the

17、B

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The new D-type trains can run at speeds (速度)of 200 to 250 kilometres       hour.The trip from Shanghai to Beijing only takes lo hours now.

A.a                         B.an                       C.the

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