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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統計： A(17), B(8), C(127), D(32), E(0) #2236518

詳解 (共 1 筆)

#4259018
當John 思考他所遇到的複雜問題的時,...
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