题目内容
―Hello, is that Ms. Blackburn, the headteacher speaking?
―I'm sorry. There isn't ____ Ms. Blackburn in our school.
A. the B. a C. one D. 不填
B
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--- Hello! Is Mr. John in the office?
--- Yes. But I’m sorry. He is busy _________ and can’t speak to you.
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A.at once |
B.at present |
C.at the end |
D.at first |