问题补充：
My hometown has changed so much that I can it.
A. know
B. understand
C. recognize
D. realize
答案：
A. know
B. understand
(答案→)C. recognize
D. realize
解析：句意：我的家乡变化有这么多，以至于我都不能 认出它来了。know认识；understand 理解；认出recognize；realize认识到，由题意很容易可知选C。
考点: 考查动词词义辨析的用法。
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