you can't imagine that rats eat 40 to 50 times _____.

问题描述:

you can't imagine that rats eat 40 to 50 times _____.
A.in weight
B.by weight
C.of weight
D.thier weight
为什么选D,thier weight之前为什么不加介词

D
因为THEIR是形容词性物主代词,前无须介词连接