问题
选择题
A driver should _____ the road when ____ . [ ]
A. concentrate on; drive
B. concentrate in; driving
C. concentrate to; drove
D. concentrate on; driving
答案
答案：D
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A driver should _____ the road when ____ . [ ]
A. concentrate on; drive
B. concentrate in; driving
C. concentrate to; drove
D. concentrate on; driving
答案：D