___How time flies!It’s already twelve o’clock.
___ Oh,really? I ______ it at all.
A．don’t realizeB．Didn’t realize
C．haven’t realizedD．hadn’t realized
B
本題考查時態(tài)。這里指在別人提醒之前并沒有意識到。故用一般過去時。句意：
——時間過得多快��！已經(jīng)12點了�！�，真的嗎？我根本沒有意識到。
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