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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1765

At first the experiment went on well, but ______ problems we hadn’t expected turned up later and it failed.

A.outstanding
B.curious
C.powerful
D.various
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Atfirsttheexperimentwentonwell