He hadn’t _______ quite what was wrong with .his mother. He knew, though, that she hadn’t been well for some time now.

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问题 He hadn’t _______ quite what was wrong with .his mother. He knew, though, that she hadn’t been well for some time now.

选项 A、worked off
B、worked on
C、worked out
D、worked at

答案C

解析选项C。work out意为“想出，搞清楚”，符合句意。其他选项意思是：A. work off消除，去除，减轻；B．work on从事于，致力于；与D．work at意义相近，均不符合句意。句意为：他还不很清楚他母亲到底怎么了，尽管他知道她身体不大舒服已有些时候了。

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大学英语六级

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