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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单项选择题
It is said in the book that Thomas Edison (1847～1931 ) ______ the world leading inventor for sixty years.
A．would be
B．has been
C．had been
D．was
单项选择题
--The boy is Telling a lie. --How do you know --His face has given him ______.
A．off
B．up
C．away
D．out
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