作业帮一道英语单选问题17.They（ ）on the program for almost one week before
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一道英语单选问题
17.They（ ）on the program for almost one week before I joined them,and now we（ ） on it as no good result have come out so far.
A.had been working; are still workingB.had worked; were still working
C.have been working; have workedD.have worked; are still working
答案选的是A,但我不理解为什么第一个空用过去完成进行时,而不用过去完成时
17.They（ ）on the program for almost one week before I joined them,and now we（ ） on it as no good result have come out so far.
A.had been working; are still workingB.had worked; were still working
C.have been working; have workedD.have worked; are still working
答案选的是A,但我不理解为什么第一个空用过去完成进行时,而不用过去完成时
我们先来看这句话的前半句 They（had been working）on the program for almost one week before I joined them
翻译为,他们在我加入之前的大约一个星期就已经开始做这个项目了.
我们再来看后半句 and now we（ are still working） on it as no good result have come out so far.
翻译为,现在我们还在一直做这个项目因为仍旧没有得出好的结果.
就是说从我加入之前就在做这个项目,到现在还一直在做,所以使用过去完成进行时.
翻译为,他们在我加入之前的大约一个星期就已经开始做这个项目了.
我们再来看后半句 and now we（ are still working） on it as no good result have come out so far.
翻译为,现在我们还在一直做这个项目因为仍旧没有得出好的结果.
就是说从我加入之前就在做这个项目,到现在还一直在做,所以使用过去完成进行时.
一道英语单选问题17.They（ ）on the program for almost one week before
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