-- 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 |
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-- 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 |
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