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题目内容
（国家开放大学英语语法）
--You’ve made great progress in your studies of English, haven’t you? --Yes, but much ______.
A. remains to do
B. is remained to do
C. remains to be done
D. is remained to be done
A. remains to do
B. is remained to do
C. remains to be done
D. is remained to be done
参考答案