但是那时拉锁并没有被广泛应用.But . the zipper wasn't used widely. 题目和参考答案——青夏教育精英家教网—

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4. 但是那时拉锁并没有被广泛应用。

But ________ ________ ________ ， the zipper wasn't used widely.

4. at that time

题目来源：同步导学案课时练九年级英语上册人教版 > Section A (1a~2d)

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