-- I'd like to invite you to a party tomorrow evening.-- Thank you, but I'll be free I&#0

发布时间：2020-08-16 07:24:01

-- 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

网友回答

A. while
B. if
C. when
(答案→)D. whether
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