His speech gave us valuable ______ into the problems of education.

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问题 His speech gave us valuable ______ into the problems of education.

选项 A、inquiry
B、investigation
C、input
D、insight

答案D

解析 习惯用法。本题中只有inquiry和insight可与into连用,但inquiry与into连用时意为调查,探访,不合题意,故选D。
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