The windows and doors come from old buildings around her town that _______.
A:pull down
B:were pulled down
C:pulled down
D:was pulled down
原核细胞和真核细胞最明显的区别在于()
1924年,列宁逝世,家住莫斯科的小姑娘尼娜给在国外的父亲写信告之此事,她在信封寄信人的地址栏上应写的国名是( )