【基础测评】
Ⅰ. 单项填空
1. As far as I know, the positive and lively activities ____our students, who used to focus on just remembering knowledge, to use their knowledge freely.
A. motivate B. motivated
C. have motivated D. had motivated
【解析】选C。考查时态。通过句子的语境as far as I know可知, 动作与现在有关, 排除B、D两项, 且motivate这个动作到现在为止已发生了, 故用完成时。
