问题描述：
一道简单的英语题 告诉我这样做的理由
6 . Peter’s parents bought a large house with a garden. It _______ be very expensive.
答案是must 为什么是must
6 . Peter’s parents bought a large house with a garden. It _______ be very expensive.
答案是must 为什么是must
问题解答：
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