21. This man spoke with such an _____ that we could hardly understand what he said.
A. advantage B. apartment
C. accent D. identity
【解析】选C。句意：这个人带着这样一种口音说话以至于我们几乎不能理解他所说的。advantage优点; apartment公寓住宅；accent口音；identity本身，身份。
22. She changed so much that I could hardly _____ her when we met again after a separation of 20 years.
A. recognize B. know
C. remember D. tell
【解析】选A。句意：她变化如此大以至于我们分别20年后又见面时几乎认不出她了。recognize辨认出；know认识，知道; remember记住; tell告诉。
