Question

帮忙分析

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

Answer 1

本题容易误选D。英语时态用法参考句意，首先看点，然后看段。及“时间点”和“持续段”。如果是过去已经结束的一段时间内，用过去完成时;如果持续到现在，用现在完成时。如果单纯过去的点而不能持续，就用过去式。英语中不同的时态都有不同的表现形式，说明了英语语言极其的精确。

根据语言精确度原则，句子强调部分为时间for almost one week before I joined them,以及后半句时间now，意思是“……到我加入他们之前”有着“持续到…加入之前”所以用过去完成时。后半句有“now”提示，故选A。
其实你可以找个专业英语老师啊！我的朋友前些日子要准备英语考试，他的选择题做得不好他就去奥威斯发展大厦29层进行系统学习后，英语效果有明显的提高并且他的英语口语有很大的改善。