题目

---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 答案：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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