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(dòng)詞辨析。句意為：習(xí)慣是人們不斷重復(fù)卻通常沒(méi)有意識(shí)到的行為，因?yàn)樗麄冊(cè)?jīng)做過(guò)多次了。know意為“知道，懂得”；understand意為“理解”；experience意為“經(jīng)歷，體驗(yàn)”；realize意為“意識(shí)到”。根據(jù)句意可知，D項(xiàng)正確。
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