progress ( )so far very good and we are sure that the work will be finished on time. a.wasb.had been c.has been d.will be

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progress ( )so far very good and we are sure that the work will be finished on time. a.wasb.had been c.has been d.will be
progress ( )so far very good and we are sure that the work will be finished on time. a.was
b.had been c.has been d.will be

progress ( )so far very good and we are sure that the work will be finished on time. a.wasb.had been c.has been d.will be
C has been .
so far常常用于现在完成时态.现在完成时表示过去发生,一直持续到现在,并将一直持续下去.你找找现在完成时的定义,然后多读几遍,好好体会一下就知道了.