Butittookabout30yearsfortheAmericanpeople_____?_______them.A：knowB：toknowC：toknowaboutD：knowabout
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题目内容：
But it took about 30 years for the American people_____?_______ them.
A：know
B：to know
C：to know about
D：know about
优质解答
选C
know about sb了解某人
It takes sb some time to do sth 这里得接不定式形式
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