问题补充：
I hear students went to the hall to have the concert.
A. two hundred
B. two hundreds
C. hundred of
D. two hundred of
答案：
(答案→)A. two hundred
B. two hundreds
C. hundred of
D. two hundred of
解析：句意：我听说二百名学生去大会堂去举行音乐会。数词修饰hundred, thousand, million, billion等词时，这些词不变复数，结尾不加s，不与介词of连用。故选A。
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