单项选择题

Only when we have weighted all the factors involved ______ decide when would be the best time to start.

A．did we
B．we did
C．can we
D．we can
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单项选择题
He spoke in whispers ______ the servants should hear him.
A．so
B．so that
C．lest
D．in order that
单项选择题
Reading ______ the mind only with materials of knowledge; it is thinking that makes what we read ours.
A．rectifies
B．prolongs
C．minimizes
D．furnishes
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