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：【答案仅供学习，请勿对照自行用药等】
选择题：The project requires more labor than ________. has been put in have been put in
- 题目分类：习题答案
- 题目类型：选择题
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