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题目内容
（河南理工大学—大学英语2）
[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
A.has， had
B.had， has
C. had， had
D.have, have
参考答案