----Are you a teacher?

----No, but I ______ in Harbin No. 3 High School for 3 years.

A． had taught

B．has taught

C．teach

D．taught

治疗低血压，应选择哪个耳穴（）。

A.角窝上

B.肾上腺

C.耳尖

D.神门

E.皮质下