A) It did rain before the Flood. The Bible never says that it never rained before the Flood. All it says is that, in the beginning, God watered the Earth with a mist. He did this once. There's nothing to suggest he did this all the time, or that it never rained.
You need to read your Bible more.
B) Even if hadn't, this is irrelevant. We're clearly talking about civilizations that arose AFTER the Flood, because we wouldn't know much about a civilization that lived before.
At the very start of Genesis, God moved upon the face of the waters. Many take this to mean God walked on water on the Earth. God then created a firmament to separate the waters which were above the firmament from the waters below it. Now hang on, think about it. If there was no existing firmament, then the waters above couldn't have been waters. This is because God refers to space as waters. God divided the waters (space) from the waters on the Earth (liquid). Some take this to mean God made a water canopy around the Earth, protecting it from the Sun and this crashed down for the flood. God had not caused it to rain, and nowhere does it say he DID cause it to rain UNTIL the flood.
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