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The train _______ at the present speed until it reaches Beijing at about 6 :30 am.
A．wentB．has goneC．goesD．will be going
D
句意：火車將以現(xiàn)在這個速度行駛，直到大約九點鐘到達山腳為止。until引導(dǎo)的句子用了一般現(xiàn)在時，說明主句要用將來時態(tài)，再根據(jù)時間狀語at the present，所以用將來進行時。
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