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
This book will show you ______ can be used in other contexts. ( )
A．how you have observed
B．how what you have observed
C．that you have observed
D．how that you have observed
单项选择题
The bedroom is in perfect condition, ______ a few scratches on the wall. ( )
A．except
B．excepting
C．except for
D．except that
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