语法与词汇 They _____ on the program for almost one week before I joined them, and now we_____ it as no good results have come out so far.

A、 have worked; were still working
B、 had worked; were still working
C、 had worked; have worked
D、 had been working; are still working

【正确答案】 D

【答案解析】句意：在我加入他们之前，他们已经着手这项项目一周了，现在我们仍然在工作，就好像我们至今为止仍未取得什么成就。本题考查的是时态，根据前半句joined，我们可以知道我加入他们是过去的事儿，所以第一个选项应该是过去完成时，第二个半句的时间是so far，所以第二个选项要用现在时，而且是现在进行时，因为我们现在还在做这项工作。