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[求助]补充教材315/316题
548. On the Great Plains, nineteenth-century settlers used mud and grass to build their homes, doing it without timber and nails. (A) settlers used mud and grass to build their homes, doing it without (B) settlers used mud and grass to build their homes, did it without (C) settlers used mud and grass to build their homes, making them while not having (D) settlers used mud and grass to build their homes, making do without (E) settlers’ homes were built of mud and grass, making do without D中,making do without 是强调吗?
433.Intended primarily to stimulate family summer travel, the new airfare, which allows both an adult and a child to fly for the price of one ticket, and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than fourteen. (A) and also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than (B) and also lessens the advance-purchase requirement for family travel to a seven-day minimum from (C) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than that of (D) also lessens the advance-purchase requirement for family travel to a seven-day minimum from (E) also shortens the advance-purchase requirement for family travel to a minimum of seven days rather than 为什么选择E? D /C错什么?
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