Either the boy or his sister must have dinner here.
A.his
B.her
C.their
D.theirs
答案:C
在△ABC中,下列关系式不一定成立的是[ ]
A.asinB=bsinA
B.a=bcosC+ccosB
C.a+b-c=2abcosC
D.b=csinA+asinC
急性细菌性痢疾假膜脱落发生于()
A.发病后1周左右
B.发病后2周左右
C.发病后3周左右
D.发病后4周左右
E.发病后5周左右