单项选择题

All of the plants now farmed on a large scale were developed from plants ______ wild.

A. that once grew
B. once they grew
C. they once grew
D. once grew
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单项选择题
She was at the ______ of her career when she was badly injured in the car accident.
A. bloom
B. peak
C. excess
D. extreme
单项选择题
The only candidate ______ can hope to defeat him is quits now.
A. who
B. which
C. that
D. when
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