He hadn’t _______ quite what was wrong with .his mother. He knew, though, that s

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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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