By the time

3.Bythe time we reach an agreement,the approvals ____.\x0d答案选B 也有的说选C\x0dPS 6.由by the time\x0d引导的时间状语从句.\x0d　　注意时态的变化：在一般情况下,如果从句的谓语动词用一般过去时,主句的谓语动词用过去完成时；如果主句的谓语动词用一般现在时,主句的谓语动词用将来完成时.例如：\x0d　　By the time you came back,I had finished this book.到你回来时,我已经写完这本书了.\x0d　　By the time you come here tomorrow,I will have finished this work.你明天来这儿的时候,我将已经完成此工作了.