Marry 填? （make）a dress when her sister came in 麻烦告诉下填什么
问题描述：
Marry 填? （make）a dress when her sister came in 麻烦告诉下填什么
答
was making 过去进行时
答
填 was making
when引导的时间状语从句，从句用过去时，主句用过去进行时
所以是 was making
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答
Marry【was making】a dress when her sister came in.
答
was making
供参考。