[单选题,1.3分] Much ______been said about the problem but nothing _______ been done so fa A.has， had B.had， has C. had， had D.have, have

[单选题,1.3分] Much ______been said about the problem but nothing _______ been done so fa
A.has， had
B.had， has
C. had， had
D.have, have

出自：河南理工大学—大学英语2

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