Her teacher helped her so much that she bought him a beautiful pen _________. A. by turns B. in retu...
2022-11-12 07:27:10 97次 2015届陕西兴平秦岭中学高三上期中英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Her teacher helped her so much that she bought him a beautiful pen _________.
A. by turns B. in return
C. in vain D. in turn
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