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 workingB．had worked; were still working
C．have been working; have workedD．have worked; are still working
A
此題的時(shí)間參照點(diǎn)是before I joined them,，所以第一個(gè)空應(yīng)該用過(guò)去完成進(jìn)行時(shí)，第二個(gè)空根據(jù)時(shí)間now用現(xiàn)在進(jìn)行時(shí)。
【標(biāo)簽】動(dòng)詞時(shí)態(tài)
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