白果在定喘汤中的作用是
A.散寒平喘B.敛肺定喘C.清泻肺热D.止咳化痰E.降气平喘
参考答案:B
Tom's mother demanded that she ________ everything on time. [ ]
A. would tell
B. tell
C. have told
D. be told
李师傅锯一段长20米的木材,锯4段用了6分钟,每段长______米,如果锯成12段要用______分钟.