She changed so much that I could hardly ______ her when we met again after a separation of 20 years.
A.recognizeB.knowC.rememberD.tell在线课程A
解析：
考查词义辨析。recognize 认出，know 知道，remember 记得，tell 告诉，句意：她改变的如此的多以至于分开二十年之后当我们再次见面，我几乎没认出她来。所以选A。