Question

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

Answer 1

A

檢查考生對(duì)動(dòng)詞時(shí)態(tài)的掌握和運(yùn)用能力。第一空，時(shí)間狀語(yǔ)從句before I joined them決定了要使用響應(yīng)的過(guò)去時(shí)態(tài)；第二空，now 決定了要使用現(xiàn)在時(shí)態(tài)。