单选题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.Ahad been working; are still workingBhad worked; were still workingChave been working; have workedDhave worked; are still working
单选题
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
参考解析
解析：
题干中前半句出现for应该用过去完成时，后半句出现now应该用现在进行时。句意为：在我加入他们之前他们就已经研究这个项目将近一个星期了，现在我们依然在研究这个项目，因为至今还没有出现什么好的结果。
题干中前半句出现for应该用过去完成时，后半句出现now应该用现在进行时。句意为：在我加入他们之前他们就已经研究这个项目将近一个星期了，现在我们依然在研究这个项目，因为至今还没有出现什么好的结果。
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