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(题文)(2017年黑龙江齐齐哈尔)—It takes me half an hour _____playing the piano. How about you?

—I usually spend 20 minutes ____it.

A. practicing ; on   B. to practice ; in   C. to practice ; on

八年级英语单选题中等难度题

少年,再来一题如何?
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