问题
选择题
I __________ a teacher. He __________ a policeman. They __________ doctors. [ ]
A. am; is; are
B. am; is; is
C. is; is; are
答案
答案：A
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I __________ a teacher. He __________ a policeman. They __________ doctors. [ ]
A. am; is; are
B. am; is; is
C. is; is; are
答案：A
，可认为（）