题目内容
-- 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.
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解析:
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whether 引导的从句作be sure的宾语。 |
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题目内容
-- 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.
[ ]
|
whether 引导的从句作be sure的宾语。 |
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