—Excuse me, but could you please turn the radio down?
—Sorry, I       you could hear it.
A．don’t realizeB．haven’t realizedC．didn’t realizeD．hadn’t realized
C
這題考查時態(tài)，根據(jù)句意：--對不起，請把收音機關小好嗎？--對不起，我沒意識到你聽見了。因為是過去沒意識到，所以用過去時 。選C。
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