It was not until last year ________ he got in touch with his father in Canada.

A．where

B．what

C．how

D．that

蝉衣的功效是（）
升麻的功效是（）

A.疏散风热、透疹

B.解毒利咽、透疹

C.凉血止血、透疹

D.清热解毒、透疹

E.升阳止泻、透疹