5 dollars is enough 为什么用is dollars 是复数啊

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• Thirty dollars___ enough for this pair of shoes.A.is B.are C.has这题答案里是A,为什么不该是B,题目中的美元不是可数名词复数,后面不该跟are吗.
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• 5 dollars is enough 为什么用is dollars 是复数啊
• 5 dollars is enough 为什么用is dollars 是复数啊
• as much as 8 hours?"8 hours ”是可数的啊,为什么用much呢?而不是as many as 8 hours?我还见过一句“as much as 100 dollars” ,字典上还有“as much as 10 degrees(摄氏度)”这些都是为什么呢?原句：he is addicted to playing computer games and spends as much as 8 hours everyday.
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• 主谓一致 twenty dollars is enough这里为什么不用are