A、  B、  C、  A所给出的问题是一个正式地请求帮助的疑问句，因此选项(A)的回答Sure，表示可以，是符合语境的正确答案。选项(B)中的any minute是针对问题中的for a minute而设计的故意迷惑大家的答

What’s in the big envelope?
(A)I’m not sure who left it there.
(B)There’s a larger one if you need it.
(C)The extra office keys.

Excuse me, do you think you could help me for a minute?
(A)Sure, what do you need?
(B)I expect him any minute.
(C)I don’t need any help, thanks.