2. 外语
  3. You can not see the manager ______ you have made an appointment with him.

You can not see the manager ______ you have made an appointment with him.

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问题 You can not see the manager ______ you have made an appointment with him.
选项 A、if
B、except
C、unless
D、when
答案C
解析 unless引导条件状语从句，表示“除非……”。通常情况下，条件状语从句主要是由if或unless引导，例如：They have a meeting every Friday, unless there is nothing to discuss．(他们每星期五开一次会，除非没有事情可商谈。)If I were you, I’d go to night school．(我要是你，我会去上夜校。)
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