A driver should ________ the road when _________.
A．concentrate on; driveB．concentrate in; driving
C．concentrate to; droveD．concentrate on; driving
D
考查短語及非謂語動詞。concentrate on集中，句中邏輯主語driver，與drive之間為主動關(guān)系，故用現(xiàn)在分詞，選D。
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