题目

题型：不详难度：来源：

They _____ on the program for almost one week before I joined them, and now, we ____on it as no good results have come out so far.

A．had been working; are still working

B．had worked; were still working

C．have been working; have worked

D．have worked; are still working

答案

A

解析

试题分析：句意：在我加入他们之前，他们一直为这项计划工作了几乎一周，我们现在还在继续进行因为现在到目前为止还没有出现好的结果。第一空根据时间状语before I joined them，可知表示在过去某个时间之前一直进行的动作，用过去完成进行；第二空表是现在正在进行，故选A。
点评：本题难度适中。动词的时态是高中语法知识点的重难之一，需要考生掌握各种时态的用法，有分析理解复杂的句子结构及语境的能力。
即学即练：Tom       in the library every night over the last three months.
A. works     B. worked     C. has been working     D. had been working
解析：C。句意：“在过去的三个月里，Tom每天晚上都在图书馆里学习。”题干中出现的over the last three months，是明显提示用现在完成进行时或现在完成时。故选C。