Although it's raining hard, ______ are still playing football on the playground.A.theyB.but theyC.and theyD.so they
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A解析本句是带让步状语从句的复合句，主句开头不能再用 but，这与汉语的表达法不同。此外 though 与 although 一样，都不能和 but 连用，但两者常可换用，although 较 though 正式，语气重些，且 although 多用于句首。