语法考点：数词 + 量词(always singlular) + Noun.
数词 + 量词(always singlular) + Noun.
真题总结举例
European settlers in North America moved from the Atlantic coast across 3000 miles forests, grasslands, deserts, and mountains until they reached the Pacific Ocean.
answer is C
It has been reported that (during) any twenty-four (hour) period,(a minimal of)three hundred North American women (start) their own businesses.
答案是将minimal改为minimum
那么此题中twenty-four hour period也没有错
the next 3 year也是在TOEFL真题中出现过的正确选项，这里的year也是用单数形式。
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