2. 外语
  3. In the______of their investigation they made a discovery that helped to solve a six-year-old mystery.

In the______of their investigation they made a discovery that helped to solve a six-year-old mystery.

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问题 In the______of their investigation they made a discovery that helped to solve a six-year-old mystery.
选项 A、light
B、course
C、face
D、event
答案B
解析 course n.过程，进程。
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