题目内容

— When _________ you________ your teeth, Billy?
—Just now.
A．do; brushB．have; brushed
C．did; brushD．was: brushing
C
特殊疑问句以特殊疑问词开头，再加上一般疑问句；brush“刷”，是行为动词，应该借助助动词构成问句，排除D；根据答语Just now.可知，用一般过去时。故选C。
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