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