【題目】—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

【答案】B
【解析】句意：他現(xiàn)在很忙，不能和你說(shuō)話。at once”立刻“；at present”現(xiàn)在，目前“；at the end”在.....末端/終點(diǎn)“；at first”起初“。因此答案選B。

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