A driver should         __ the road when           .
A．concentrate on; drive B．concentrate in; driving
C．concentrate to; drove D．concentrate on; driving
Ｄ

試題分析：句意： 駕車的時候，司機應該集中精力在路上�！叭褙炞⒂冢笔�concentrate on，后面是一個省略了主語的時間狀語從句。故選Ｄ。
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