2. 外语
  3. I didn’t know______certain, but I guessed that she was over 70.

I didn’t know______certain, but I guessed that she was over 70.

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问题 I didn’t know______certain, but I guessed that she was over 70.
选项 A、of
B、in
C、with
D、for
答案D
解析 本题考查固定搭配for certain，意为“确定地”，其他介词都无法与certain搭配。
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