问题
选择题
All of the Plants now raised on farms have been developed from plants __ wild.
A．once they grow
B．they grew once
C．that once grew
D．once grew
答案
答案：C
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All of the Plants now raised on farms have been developed from plants __ wild.
A．once they grow
B．they grew once
C．that once grew
D．once grew
答案：C