单项选择题

They are seeking to ______ the most advanced technological levels in the world.

A．obtain
B．gain
C．attain
D．arrive to
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单项选择题
The book is worth ______.
A．read
B．being read
C．reading
D．having read
单项选择题
I haven' t decided which hotel ______.
A．to stay
B．is to stay at
C．to stay at
D．is for staying
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