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题目内容
（郑州工程技术学院-大学英语（2））
3.
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
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