题干
— ___________ my baseball?
— ________ under the sofa.
A：Where; It
B：Where's; It's
C：Where; It's
D：Where's; It
答案(点此获取答案解析）
B
— ___________ my baseball?
— ________ under the sofa.
A：Where; It
B：Where's; It's
C：Where; It's
D：Where's; It
酯中残留
的乙酸，加过量饱和Na2CO3溶液振荡后，静置分液