问题
选择题
-- I'd like to invite you to a party tomorrow evening.
-- Thank you, but ______ I'll be free I'm uncertain.
A．while
B．if
C．when
D．whether
答案
答案：D
搜题请搜索小程序“爱下问搜题”
-- I'd like to invite you to a party tomorrow evening.
-- Thank you, but ______ I'll be free I'm uncertain.
A．while
B．if
C．when
D．whether
答案：D