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题目内容
（内蒙古农业大学-大学英语4）
(单选题) He tried to stand on his hands for five minutes, _______ is rather a difficult thing to do.(本题3.0分)
A、 that
B、 which
C、 whose
D、 /
A、 that
B、 which
C、 whose
D、 /
参考答案
