题目

It was in the factory _________ his friend worked  _______ he picked up a lot of experience.   A. where, where      B. that, where    C. that, that      D. where, that 答案：D 【解析】考查强调句型及定语从句。第一空为where引导的定语从句；第二空强调句型中的that。某一物体做变速直线运动，已知它在前一半路程的速度位4m/s，后一半路程的速度是6m/s，那么，它在整个路程中的平均速度是（ ）A．4m/sB．4.8m/sC．5m/sD．6m/s