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---Imagination     important in science, and it helps us dream up our future.
---You are definitely right. If only something         allow me to see insects and spiders magnified without getting close to them.
A.was; would B.is; willC.will be; canD.is ;could
D
第一空是陈述客观真理, 所以用一般现在时态;第二空是虚拟语气,与现在事实相反,用过去式,选D
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