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17. When John bumps up against a complex problem, he thinks back to a lesson he __________ in high school.
(A) is learning
(B) learn
(C) learned
(D) was learning。


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Min 小一上 (2020/09/08)
當John 思考他所遇到的複雜問題的時, ...


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17.When John bumps up against a complex ..-阿摩線上測驗