第18题: [单项选择]It was a long time ______ the neighbors found that the old lady had been dead of cold. A. when B. until C. since D. before 参考答案:D 答案解析:固定句型用法题。“It's…before…”句型表示“…之后才…”。until表示“直到…为止”常常用在否定句型中。“It's…since…”句型表示“自从…以来已经多长时间了”;而when表示“在…
第19题: [单项选择][*] 参考答案:B 答案解析:[解析] F: We got to the train station very late.