单项选择题

All of the plants now raised on farms, have been developed from plants ______ wild. ( )

A．once they grew
B．they grew once
C．that once grew
D．once grew
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单项选择题
No sooner ______ the news than they rushed out into the street. ( )
A．they heard
B．they had hear
C．did they hear
D．had they heard
单项选择题
All those youngesters will become ______ in ten years. ( )
A．growns-ups
B．growns-up
C．grown-up
D．grown-ups
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