单项选择题

--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

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These two vases are so（）that we can't tell one from the other.

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B. different
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That teacher is very good（）children.

A. over
B. at
C. on
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