题目内容
15. Mary used to stand at the window and wave good?bye. (改为一般疑问句)
Mary_____________ stand at the window and wave goodbye?
15. Did;use to
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题目内容
15. Mary used to stand at the window and wave good?bye. (改为一般疑问句)
Mary_____________ stand at the window and wave goodbye?
15. Did;use to