题目内容：
The project requires more labor than ________.
has been put in
have been put in
being put in
to be put in
参考答案：
选择题：The project requires more labor than ________. has been put in have been put in
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简述安全经济学的研究对象
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请选择(8)处最佳答案( )。
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supervised held managed presided
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What is the author’s attitude towards the Parliament? Indignant. Skeptic
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