经行吐衄的病因下列哪些是正确的 （）
A.大病久病
B.肝火偏亢
C.痰湿内阻
D.素体阴虚
E.气火上逆
参考答案：A, B, D, E
—There is someone in the classroom.
—It ________ be Lucy. She always gets to school early.[ ]
A. can
B. may
C. must
D. mustn't
