What were you doing this time yesterday? -I on the grass and drawing a picture.


A.sit B.sa饥笭观蝗攥豪硅通亥坤t C.am sitting D.was sitting

求解析求答案!!

D 典型的过去进行时态
昨天你在干什么?
我在草坪上画画
D过去进行时,were was +doing
D,昨天,过去进行时……


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