The project requires more labor than ___ because it is extremely difficult.
A has been put in B have been put in C being put in
D to be put in
人气：368 ℃ 时间：2019-10-20 19:34:58
解答
A
句意为:这项工程要求(比现在)更多的人力,因为它极其困难.
可见时态为现在完成时,排除C(进行时)和D(将来时)
labor不可数名词,谓语用单数,排除B
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