Many of us visited the industrial exhibition, ______, to our disappointment, we

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问题 Many of us visited the industrial exhibition, ______, to our disappointment, we saw very few high-tech products.

选项 A、where
B、which
C、as
D、that

答案 A

解析关系副词。本题中to our disappointment为插入语，故需要填入非限制性定语从句的引导词。先行词exhibition是一个地点概念，在句子作状语的一部分，故应填入关系副词where。

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