问题
选择题
Happy _____ they were, there was something missing.[ ]
A. if
B. when
C. since
D.as
答案
答案：D
搜题请搜索小程序“爱下问搜题”
Happy _____ they were, there was something missing.[ ]
A. if
B. when
C. since
D.as
答案：D
