Have you heard that the research he spent most of his time_______ perfect success? A. on was a B. to...
2022-12-08 16:26:36 192次 2014-2015学年江苏省九年级上学期期末考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Have you heard that the research he spent most of his time_______ perfect success?
A. on was a B. to be
C. being a D. on being
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