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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