选C
首先判断时态,yet是完成时一种标记
并列主语表示同一概念时,后面用单数,所以用has
例如：Bread and butter is served for breakfast.
早餐有提供面包和黄油
Early to bed and early to rise is a good habit.
早睡早起是好习惯
when and where to build the new factory__yet
4个回答
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