52单词网 > 高中英语 > 高中英语题库 > -- I'd like to invite you to a concert this evening. -- Thank you, but I'm not s

-- I'd like to invite you to a concert this evening. -- Thank you, but I'm not s

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-- I'd like to invite you to a concert this evening. -- Thank you, but I'm not s

-- 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

试题答案

答案：

解析：

whether引导的从句作be sure的宾语。

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