渗出性多形性红斑重症患者黏膜损害的发生率为（）
A.10%
B.＜15%
C.20%~45%
D.60%
E.＞70%
参考答案：E
- Could you tell me_______？
- Every four years.
A．how often the Olympic Games take place
B．when the Olympic Games are held
C．how often are the Olympic Games held
D．how often the Olympic Games were held
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