问题
选择题
Busy _____ he was, he tried his best to help you.
A．as
B．when
C．since
D．for
答案
答案：A
搜题请搜索小程序“爱下问搜题”
Busy _____ he was, he tried his best to help you.
A．as
B．when
C．since
D．for
答案：A