单选题 They made detailed investigations to ______ themselves with the needs of the rural market.
A. adhere B. acknowledge C. acquaint D. activate

【正确答案】 C

【答案解析】[解析] A．adhere粘附，坚持。B．acknowledge承认，报偿。C．acquaint使熟知，介绍，通知。acquaint sb/onself with使熟悉或了解某事物。D．activate刺激，使活动。