two Christmas trees are of ___size,but the one they bought yesterday is maybe twic
问题描述：
two Christmas trees are of ___size,but the one they bought yesterday is maybe twic
These two Christmas trees are of ___size,but the one they bought yesterday is maybe twice ___size of them.
A.the,the B.a,the C.a,a D.the,a
求解释第二个选项
答
be of a size 同一个尺寸
be twice the size of .的两倍大