on
强调在哪一天,我们通常用介词on.--------on Monday,on October 10th .on the school open day不是一个短语吗?为什么去了the也行啊on school open day------泛指“学校的开放日”，不强调哪个所学校。 on THE school open day--------特指某所学校的“学校的开放日”，所以我们要加the.
（ ）school open day,parents’ can watch our lessons.A、On B、In C、Up D、At 选什么,说明原因
（ ）school open day,parents’ can watch our lessons.A、On B、In C、Up D、At 选什么,说明原因
英语人气：764 ℃时间：2019-10-11 20:15:42
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