Don't call me at the office ________ it's absolutely necessary.

Don't call me at the office ________ it's absolutely necessary.
A、unless
B、since
C、as
D、if
【正确答案】：A
【题目解析】：此句话的意思是除非在必要时，否则不要在办公室给我打电话。分析句子可知，空白处缺少一个连词，“unless”表示除非，除非在...情况下；“since”表示因为，从...以后；“as”当...时，正如；“if”表示如果，假如。

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Don't call me at the office ________ it's absolutely necessary.

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