2. 外语
  3. They have seen many interesting things ______ they started their trip last month.

They have seen many interesting things ______ they started their trip last month.

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问题 They have seen many interesting things ______ they started their trip last month.
选项 A、since
B、before
C、until
答案A
解析 句意：自上个月开始旅行以来，他们看到过许多趣事。本题考查连同的用法。before引起的时间状语多用于一般过去时中；until要和not连用，构成not．．．until句型，所以B、C应排除。故A项正确：在现在完成时中表示时间的两个标志性连词是 since和for，since后面接表示一个时间点的时间状语，for后接表示一段时间的时间状语。
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