— When _________ you________ your teeth, Billy?
—Just now.
A．do; brushB．have; brushed
C．did; brushD．was: brushing
C
特殊疑問(wèn)句以特殊疑問(wèn)詞開(kāi)頭，再加上一般疑問(wèn)句；brush“刷”，是行為動(dòng)詞，應(yīng)該借助助動(dòng)詞構(gòu)成問(wèn)句，排除D；根據(jù)答語(yǔ)Just now.可知，用一般過(guò)去時(shí)。故選C。
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