——A——— no electronic computers,there would have been no artificial satellites or rockets.

——A——— no electronic computers,there would have been no artificial satellites or rockets.

题目
——A——— no electronic computers,there would have been no artificial satellites or rockets.
A.Had there been B.If there were
C.should there be D.If there might be
请问为什么会是A,而不是其他的了,又是怎么看句子结构,求详解.
答案
A Had there been这是一个倒装的虚拟语气句子(Had there been) no electronic computers,there would have been no artificial satellites or rockets.要不是电子计算机(的出现),就不会有人造卫星或火箭....
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