______is smart.a.The car of my sisterb.My sister carc.My sis

______is smart.
a.The car of my sister
b.My sister car
c.My sister's car
答案选 C.sister's为名词所有格,修饰后面的名词 car,意为“姐姐的车”.根据语法规则,此题选 a 也不算错,因为对于有生命的名词而言,可以有两种所有格方式,但命题者估计是对初学者作考查,设定的答案为 c.
The_______is shut.
a.room's door.
b.door of the room.
c.room door.
答案为 b.由于 room 没有生命,故要用 of 构成所有格.