-- I’d like to invite you to a concert this evening.
-- Thank you, but _______ I’ll be free I’m not sure at the moment.
A.while | B.if | C.whether | D.when |
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-- I’d like to invite you to a concert this evening.
-- Thank you, but _______ I’ll be free I’m not sure at the moment.
A.while | B.if | C.whether | D.when |