问题描述：
A:The box is really heavy.Do you need any help?
B:_____,but I think I can make it.
A、That's OK B、I'm sorry C、No,thanks D、It's very kind of you
B:_____,but I think I can make it.
A、That's OK B、I'm sorry C、No,thanks D、It's very kind of you
问题解答：
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