题目

— Is that the country clinic you often refer to?      — Right，just the one      you know my father used to work for 10 years        A. that                  B. which               C. where               D. as 答案：C3．设向量$\overrightarrow{AB}=（x，x+1），\overrightarrow{CD}=（1，-2）$，且$\overrightarrow{AB}$∥$\overrightarrow{CD}$，则x=-$\frac{1}{3}$．