簡單做法：先看后一空：有yet,所以是have not done 即現(xiàn)在完成時(shí)+ 主動(dòng),（固定搭配：reach a conclusion）
第一空：由于后有提示還未結(jié)束,所以這個(gè)動(dòng)作于過去開始,到了現(xiàn)在,將來還有可能繼續(xù),所以典型的have been doing即現(xiàn)在完成進(jìn)行時(shí)結(jié)構(gòu)
最后答案明確：A
We( )the problem for quite some time,but we( )any conclusion yet.
We( )the problem for quite some time,but we( )any conclusion yet.
A.have been discussing.haven't reached
B.have disscussed.haven't been reaching
C.discussed.haven't reached
D.had discussed.haven't reached
A.have been discussing.haven't reached
B.have disscussed.haven't been reaching
C.discussed.haven't reached
D.had discussed.haven't reached
英語人氣：527 ℃時(shí)間：2020-02-01 08:35:57
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