乳腺癌最常见的转移部位是（）
A.肝脏
B.肺
C.骨
D.同侧腋窝淋巴结
E.脑
参考答案：D
Today is Wednesday. He __________ be at home. He __________ be at school.[ ]
A. can't, can
B. can't, must
C. mustn't, must
D. mustn't, can
公共选择学说隐含的一个观点是市场失灵。
