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
He always tells lies though he ______ honest.
A．feels
B．seems
C．looks
D．appears
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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
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