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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; will  C. will be; can   D. is ;could

D


解析:

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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