单项选择题

This semester, the courses Williams has taken are History, Mathematics, Chemistry and Physics, Mathematics ______ the most important.

A．is
B．being
C．has been
D．of
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Native demands are not just based on political grievances, ______. They also claim the land they owned.
A．too
B．though
C．however
D．either
单项选择题
To be more efficient, you need to ______ the agenda for every day.
A．set
B．let
C．put
D．get
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