问题
选择题
He was so tired that he couldn't work any longer.[ ]
A. wasn't allowed to
B. shouldn't
C. wasn't able to
D. mustn't
答案
答案：C
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He was so tired that he couldn't work any longer.[ ]
A. wasn't allowed to
B. shouldn't
C. wasn't able to
D. mustn't
答案：C