问题
选择题
--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
答案
答案：C
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"。