The habit is something that someone does repeatedly and often does not ________ because they have done it so many times before.
A．knowB．understand
C．experienceD．realize
D
答案：D　考查動詞辨析。句意為：習慣是人們不斷重復卻通常沒有意識到的行為，因為他們曾經(jīng)做過多次了。know意為“知道，懂得”；understand意為“理解”；experience意為“經(jīng)歷，體驗”；realize意為“意識到”。根據(jù)句意可知，D項正確。
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