炙甘草不具备的作用是（）
A.补脾益气
B.敛肺止咳
C.缓急止痛
D.清热解毒
E.调和诸药
参考答案：D
You（）buy a gift, but you can if you want to.
A. must
B. mustn't
C. have to
D. don't have to
