The project requires more labor than ______ because it is extremely difficult.

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问题 The project requires more labor than ______ because it is extremely difficult.

选项 A、has been put in
B、have been put in
C、being put in
D、to be put in

答案A

解析 根据句意,应用现在完成时态,排除C、D项;labor不可数名词,谓语用单数,排除B项。
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