—Tou’ve made great progress in your studies of English,haven’t you? —Yes, but much______.

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问题 —Tou’ve made great progress in your studies of English,haven’t you? —Yes, but much______.

选项 A、remains to do
B、is remained to do
C、remains to be done
D、is remained to be done

答案C

解析 remain作系动词用,本身不用于被动语态,有时与不定式的被动结构构成合成谓语,意为“尚待”。如:A number of problems remain to be solved.
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