术后最容易复发的肿瘤是（）
A.肾癌
B.肾盂癌
C.肾母细胞瘤
D.膀胱癌
E.前列腺癌
参考答案：D
—Must I finish the work before five o'clock?
—No, you _____. [ ]
A. needn't
B. mustn't
C. have to
D. don't
唐代江南西道所辖州数为（）个。
