问题
选择题
No one answered my phone, so the Whites ______ be at home. [ ]
A. shouldn't
B. couldn't
C. mustn't
D. needn't
答案
答案：B
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No one answered my phone, so the Whites ______ be at home. [ ]
A. shouldn't
B. couldn't
C. mustn't
D. needn't
答案：B