A. engage B. adopt C. contribute D. devote
A. plugged B. heaved C. grabbed D. pursued
A. design B. device C. resign D. color
A. However B. Since C. Therefore D. But
A. 水泥混凝土高级路面 B. 中级路面 C. 沥青贯入碎(砾)石次高级路面 D. 低级路面 E. 沥青表面处治的次高级路面
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