2. 外语
  3. A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

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问题 A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
选项 A、before
B、until
C、since
D、when
答案A
解析 题型：语法题。“It，s...before”句型表示“(……之后)才……”之意。until直到……为止，在否定句中多译为直到……才，该词一般不用在it is until肯定句型中。It is(has been)...since句型表示自……以来已有……时间了。
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