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INTERMEDIATE LEVEL

like: Chúng tôi từng đến Canada rồi, nhưng chúng tôi chưa từng đến Alaska. → →

We've been to Canada, but we haven't been to Alaska. ☊

Chúng tôi từng đến Canada rồi, nhưng chúng tôi chưa từng đến Alaska. ☊