some animals are dangerous.that's( )they( )stay in cages A because,have to B why,must C becau,must

问题描述:

some animals are dangerous.that's( )they( )stay in cages A because,have to B why,must C becau,must
D why,have to(解析

D
动物很危险,必须(不得不)关笼里.A C肯定错.B D的话因为动物不是自己要关笼里的,是被人强迫的,所以选HAVE TO为什么 要用why而不是because?动物很危险,这就是"为什么"它们要关笼里.用BECAUSE的话变成了动物很危险,这就是因为他们要关笼子里.. 显然不对的.并不是关了笼子里后才危险的..