单项选择题

I ______ come yesterday, but I could not.

A．was to have
B．must
C．ought
D．have to
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单项选择题
I don't like this hat. Please show me ______.
A．another
B．the other
C．others
D．both
单项选择题
In a second-hand bookshop, Billy came across a book which he thought was certainly a ______edition.
A．rare
B．scarce
C．seldom
D．hardly
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