she (not open) the box yesterday.she often (enjoy)herself.
问题描述：
she (not open) the box yesterday.she often (enjoy)herself.
答
第一句有yesterday 用 didn't open
第二句有often用 enjoys
答
didn't open
enjoys
答
前半句 yesterday 昨天,所以用过去式
didn't open
第二句 often 经常,用一般现在时
enjoys
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