问题
选择题
This sofa used to _____ a bed when a relative came to stay with us. [ ]
A. use for
B. make into
C. serve as
D. stand for
答案
答案：C
搜题请搜索小程序“爱下问搜题”
This sofa used to _____ a bed when a relative came to stay with us. [ ]
A. use for
B. make into
C. serve as
D. stand for
答案：C
请根据图中信息回答下列问题。