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 “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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