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选择题
The tree, _____ branches are almost bare, is very old.
A. its
B. whose
C. of which
D. on which
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单项选择题
一般认为直肠癌向下浸润的距离不超过距肿瘤边缘()
A.1~2cm
B.2~3cm
C.4~5cm
D.5~6cm
E.6cm以上
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