题目内容
（请给出正确答案）
[单选题]
It promised to be a more difficult ____ than might appear at first sight.
A.indication
B.obligatioin
C.duty
D.undertaking
提问人：网友leiyuzhou
发布时间：2022-01-07
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B、obligatioin
C、duty
D、undertaking
题目内容
（请给出正确答案）
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