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He _______ English by making word cards. But now he _____ it by listening to tapes. A.used to learn ...
题目内容：
He _______ English by making word cards. But now he _____ it by listening to tapes.
A.used to learn is used to learn
B.is used to learn used to learn
C.is used to learning used to learn
D. used to learn is used to learning
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