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英语语法问题Much ______been said about the problem but nothing ___

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英语语法问题
Much ______been said about the problem but nothing _______ been done so far.
A.has,had B.had,has
 The world’s supplies of petroleum _____.
A.have gradually exhausted B.are being gradually exhausted
C.are gradually exhausted
In many parts of the world the only ________ water supply lies below the ground.
A.continuous B.permanent
C.instant D.constant

Without trees our world _______ a much drier place.
A.will be
B.would be C.must be

 I would appreciate ______ it a secret.
A.your keeping B.you to keep
选哪个为什么说明原因.
英语语法问题Much ______been said about the problem but nothing ___
1 选项都不对 应该是 都是现在完成时 或者第一句 用一般现在时
即 答案是 has ,has
2 B
3 A
4 B.would be与现在相反的虚拟语气
5 A
再问: 第3题permanent不行吗?
再答: 我认为行 没有看到名词supply 所以这道题 可以选permanent
再问: 有supply In many parts of the world the only ________ water SUPPLY lies below the ground.