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— 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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