单项选择题

The professor recommends that we ______ tile experiment until it is carefully designed.

A．don't start
B．not start
C．will not start
D．are not to start
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单项选择题
This magazine can keep you ______ the latest development in the field of medicine.
A．be informed of
B．to inform of
C．informed of
D．informing of
单项选择题
Details of the scheme have not yet been ______ to the public.
A．released
B．relieved
C．relief
D．related
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