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
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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
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
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