【单选题】He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't been well for some time now.
A．worked off
B．worked on
C．worked out
D．worked at
【单选题】He hadn't _______ quite what was wrong with .his mother. He knew, though, that she hadn't been well for some time now.
A．worked off
B．worked on
C．worked out
D．worked at
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