--- Hello! Is Mr. John in the office? --...

--- 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 【解析】词义辨析。A立刻，马上；B现在；C最后；D起初。句意：—你好，Mr John在办公室吗？—是的。但是对不起。他现在很忙，没有时间和你说话。故B正确。

考点分析：

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