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英语大侠请接招Indonesia'sflagisbasedonanationalflagbacktothe13thcenturyhadredandwhitestripes.前空填dating后空填that为什么?

题目详情
英语大侠请接招
Indonesia's flag is based on a national flag_____back to the 13th century_____had red and white stripes.
前空填dating 后空填that
为什么?
▼优质解答
答案和解析
date back to 追溯到.
dating back to the 13th century用来修饰a national flag 得用动名词形态
后空用that表限定(限定flag)