单项选择题

I can't ______ what has happened to the vegetables, for they were freshly picked this morning.

A．figure out
B．draw out
C．look out
D．work out
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单项选择题
If you know what the trouble is, why don't you help them to ______ the situation
A．simplify
B．modify
C．verify
D．rectify
单项选择题
American companies are evolving from mass - production manufacturing to ______ enterprises.
A．moveable
B．changing
C．flexible
D．varying
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