单项选择题

No one, except his two best friends, ______ where he is.

A．know
B．knows
C．to know
D．knowing
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单项选择题
He said, I ______ a lot of new poems by the end of last year.
A．h ad already learnt
B．have already learnt
C．would have already learnt
D．already learnt
单项选择题
It is requested that every student ______ a paper on sustainable development.
A．writes
B．wrote
C．writing
D．write
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