题目

题型：不详难度：来源：

The task _______ by the time you come back.

A．has been completed

B．will have been completed

C．will complete

D．has completed

答案

B

解析

此题考查时间状语从句。by the time+一般现在时态，主句应用将来完成时态，by the time+一般过去时态，主句应用过去完成时态，题中by the time后面是一般现在时态you come back，故选B，若掌握by the time的用法，就不难了。