An Australian man, who______for years, finally discovered the cause of his backache last month.

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问题 An Australian man, who______for years, finally discovered the cause of his backache last month.

选项 A、suffers
B、has been suffered
C、is suffering
D、has been suffering

答案D

解析句意：一个澳大利亚人，受到背痛折磨多年，终于在上个月发现了病因。由于这个澳大利亚人在过去遭受了折磨，并对现在仍然有持续性影响，将继续持续下去，所以选择现在完成进行时。故正确答案为D。

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