You can hardly imagine the they went . A. suffering; throughB. concern; throughC. recove

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(答案→)A. suffering; through
B. concern; through
C. recovery; over
D. worry; over
解析：考查名词辨析和定语从句。句意：你几乎想象不到他们经历的痛苦。suffering痛苦，苦难，折磨；concern关心；recovery恢复；worry担忧；go through经历，经受；go over仔细检查。故选A。