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Shortly after the accident ,two ______ police were sent to t

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Shortly after the accident ,two ______ police were sent to the spot to keep order .
A.dozens of
B.dozens
C.dozen of
D.dozen
答案D英语中一些表示数字的名词的前面如果用了数词,这些名词必须是单数形式,如dozen(一打),score(二十)和head (头) 等,例如:另外两打鸡蛋another two dozen eggs ; 八十七年前four score and seven years ago ; 五...