The train CRH380A, ___ trial operation on the Shanghai-Hangzhou high-speed railway, set a speed record of 416．6 kilometers per hour．
| A．started | B．to start | C．starting | D．being started |
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The train CRH380A, ___ trial operation on the Shanghai-Hangzhou high-speed railway, set a speed record of 416．6 kilometers per hour．
| A．started | B．to start | C．starting | D．being started |
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