问题
选择题
The backpack be Linda's. It be Grace's. I saw it at her home before.[ ]
A. mustn't, must
B. can't, must
C. may not, can
D. could, might
答案
答案：B
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The backpack be Linda's. It be Grace's. I saw it at her home before.[ ]
A. mustn't, must
B. can't, must
C. may not, can
D. could, might
答案：B