问题: 1、It took 10000 people more than 10 years to build
1、It took 10000 people more than 10 years to build the Great Pyramid.
Oh, that ________ a very hard task.
A must be B must have been为什么不用A？
2、We must take measures to protect these species.
That's true.When animals and plants disappear,______
A so does man B so will man为什么不是A，动词不是应该与前面一致吗，如果用B的话前面不也应该是将来时吗
解答:
It took 10000 people more than 10 years to build the Great Pyramid.
Oh, that ________ a very hard task.
因为是took，表示过去式，用过去式have done表示.
根据意思表示当动植物消失的时候，人类也将消失，表示未来会发生的事，所以用so will man.
参考文献：个人观点
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