On foggy days, you have to drive very on the expressway to avoid traffic accidents.
A. cautiously
B. neatly
C. smoothly
D. properly
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(答案→)A. cautiously
B. neatly
C. smoothly
D. properly
解析：考查副词：A. cautiously谨慎地B. neatly整洁地C. smoothly 光滑地D. properly适当地，句意：在有雾的日子我不得不在高速公路上小心驾驶为了避免交通事故，选A。