-______ eraser is it on the desk?
-It's John's.[ ]
A. Who
B. What
C. Which
D. Whose
答案:D
成人的主要造血器官是()
A.骨髓
B.肝
C.脾
D.淋巴结
E.胸腺
—Where is _____ backpack?
—It's _____ the sofa. [ ]
A. she; under
B. her; in
C. she; on
D. her; on