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
Why didn't you make me a telephone call yesterday I ______ about it.
A．should be told
B．ought to have been told
C．should have told
D．ought to be told
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