答案:B
小鼠的H-2基因定位于小鼠的哪号染色体上()
A.第6号
B.第15号
C.第17号
D.第16号
E.第5号
— I stayed at a hotel while in New York .
— Oh , did you ? You ____ with Barbara .
—
A.could have stayed
B.could stay
C.would stay
D.must have stayed