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．had been working; are still working?
B．had worked; were still working?
C．have been working; have worked?
D．have worked; are still working?
A?
第一個(gè)動(dòng)作發(fā)生在“我” 加入之前，又由于現(xiàn)在還在做，所以它的時(shí)態(tài)應(yīng)用過去完成進(jìn)行時(shí)；now證明第二個(gè)空格與現(xiàn)在有關(guān)，所以滿足條件的只有A項(xiàng)。
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