单选题 What small businesses need to learn from larger competitors is how developing a dynamic learning environment______innovation, strengthens market position, and develops a true competitive advantage.
A. propels B. restrains C. prescribes D. improvises

【正确答案】 A

【答案解析】[解析] propel“推进，驱使”；restrain“抑制，制止”；prescribe“指示，规定，处(方)，开(药)”；improvise“临时准备”。