转让房地产开发项目,转让人和受让人应当自土地使用权变更登记手续办理完毕之后()日内到房地产开发主管部门备案。
A.30
B.120
C.60
D.90
参考答案:A
Tom _______ his homework at home. [ ]
A. doesn't
B. don't do
C. don't does
D. doesn't do
人体内的吞噬细胞包含()
A、中性粒细胞
B、红细胞
C、造血干细胞
D、B-淋巴细胞