单项选择题

______ your opinions are worth considering, the committee finds it unwise to place too much importance on them.

A．As
B．Since
C．Provided
D．While
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单项选择题
He explained everything over and over again ______ anyone should misunderstand him.
A．since
B．when
C．lest
D．as if
单项选择题
Because of the complexity of the modern machine, most offices require secretaries ______.
A．to have specified training
B．specified in traing
C．to train secifiedly
D．training specified
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