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

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

出自：郑州工程技术学院-大学英语（2）

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