一道有关定语从句的高中英语题

The Greens will move into the new house next Monday,( B )it will be completely finished.
A.by the time B.by which time C.by that time D.by this time
考点：介词+关系代词引导的定语从句
翻译：格林一家下周一就会搬到新房子里,到那时房子就全建好了.
答案解析：定语从句 by which time it will be completely finished 修饰 next Monday,该从句的完整句是：it will be completely finished by next Monday.变从句是,将next Monday提前成为先行词,并用关系代词which time (when也可以) 代替原句成分,将介词+关系代词（by which time) 作为引导.