单项选择题

Somebody ______ here only this morning.

A．must be
B．can be
C．must have been
D．should have been
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单项选择题
This is one of the most beautiful pictures of scenery that______displayed here.
A．is
B．are
C．has been
D．have been
单项选择题
The gardener was called in to tell the way _____ the poor dog had died.
A．/
B．in that
C．which
D．by which
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