题目内容：
All of the plants now farmed on a large scale were developed from plants ____ wild.
(A) that once grow
(B) once they grow
(C) they once grew
(D) once grew
参考答案：
选择题：All of the plants now farmed on a large scale were
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All of the plants now farmed on a large scale were developed from plants ____ wild.
(A) that once grow
(B) once they grow
(C) they once grew
(D) once grew