于四时六气之不同，人体素质之差异，在临床上有风寒、风热和暑湿等的不同证候，但在病程中不会出现寒与热转化。
参考答案：错
—When did you know the fact?
—I didn't know about it ________ ray aunt told me. [ ]
A. after
B. until
C. unless
合理预期
