题目内容
（请给出正确答案）
[主观题]
—You' ve made great progress in your studies of English, haven' t you？—Yes, but much______
—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
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