题目内容
---Was it the new school headmaster who walked by ?
--- _____.
A. It must be that B. It must have been C. He must be D. This must have been
B
解析:
略

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题目内容
---Was it the new school headmaster who walked by ?
--- _____.
A. It must be that B. It must have been C. He must be D. This must have been
B
略