--You’ve made great progress in your studies of English, haven’t you? --Yes, but much ______.<br />A. remains to do <br>B. is remained to do<br>C. remains to be done <br>D. is remained to be done

--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

出自：国家开放大学英语语法

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