题目内容
—Hello! Is Mr. John in the office?
—Yes. But I’m sorry. He is busy _____ and can’t speak to you.
A. at once B. at present
C. at the end D. at first
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.
A.at once |
B.at present |
C.at the end |
D.at first |