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29(08南通市四县高三第一次联考)A clear，warm day suddenly grew chill _____a dark curtain of rolling dust advanced across the plains.
A.until B.as C.so D.since
30(08南通市四县高三第一次联考) _____in her life Jennie gained a clear idea of how large the world is.
A.The first time B.For the first time C.At first D.At the first time