问题

Young people are seeking excitement and challenges, and going where big companies are is ____ leads to so many old people being left alone in villages.

A:where
B:when
C:what
D:who

正确答案是：

同类题型

Good morning. I want to buy two ____.—OK. Here you are.

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are always coming in here borrowing my hammer, you know, to fix a cart wheel or ______.

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