--I'dliketoinviteyoutoaconcertthisevening.--Thankyou,butI'mn

发布时间:2020-08-07 04:08:59

-- I'd like to invite you to a concert this evening.-- Thank you, but I'm not sure at the moment ________ I'll be free.A.whenB.whileC.weatherD.whether

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D解析whether引导的从句作be sure的宾语。
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