— Jack, you look tired today. What's wrong? — I was ____________ busy ____________ I didn't go to bed until midnight y

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1. (2019九上·德惠月考) — Jack, you look tired today. What's wrong?
— I was ____________ busy ____________ I didn't go to bed until midnight yesterday.

A . too; to B . so; that C . enough; to D . such; that

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