Do you remember a certain occasion ________ you were in trouble and at that moment I gave you a hand.

A．when

B．which

C．why

D．where

竹叶石膏汤的功用是（）

A.清热解毒，养阴生津

B.清热养阴，利水通淋

C.清热生津，益气通络

D.辛凉宣泄，清肺平喘

E.清热生津，益气和胃