单项选择题

(It was) (in the) primary school (where) my teacher introduced (me to) computers.

A．It was
B．in the
C．where
D．me to
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单项选择题
I'm (old enough) (not to) let my trouble (to interfere) (with) my work.
A．old enough
B．not to
C．to interfere
D．with
单项选择题
They have developed techniques which are ______to those used in most factories.
A．more
B．better
C．greater
D．superior
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