(2014·東北三校模擬)We had just covered half the journey________the engine failed and we could do nothing but wait for help.
A．beforeB．since
C．when　D．until
C
句意為：我們剛走了一半這時(shí)發(fā)動機(jī)就出故障了，我們別無選擇只能等著救援到來。when就在這時(shí)；突然……。before在……之前；since自從；既然；until直到。
答案：　C
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