A-A+
A man escaped from the prison last night. It w
问题详情
A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.
A．before
B．until
C．since
D．when
参考答案
正确答案：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。
