问题标题：
【Theyplantedtreesyesterday.(改为否定句）They()()treesyewterday.】
问题描述：
Theyplantedtreesyesterday.(改为否定句）
They()()treesyewterday.
侯守琴回答：
Theydidn'tplanttreesyesterday.
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