I’m in . What about you?A. Class OneB. One ClassC. class oneD. one class

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(答案→)A. Class One
B. One Class
C. class one
D. one class
解析：A考查基数词和序数词。Class One= the first class,班级，房间号等表示方法有两种。①Class /Room+基数词 ②the +序数词+class/ room。