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-----Mum, I’ve signed for a big box by Future Express(快递). What' s in it? -----I'm not sure. It_____...
题目内容：
-----Mum, I’ve signed for a big box by Future Express(快递). What' s in it?
-----I'm not sure. It________ be a present from your brother.
A. might B. must C. should D. will
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