单项选择题 Her uncle′s health has greatly improved______ he stopped smoking.

单项选择题 根据以下材料，回答题Every day 25 million U.S. children fideschool buses. The safety record for these buses is much better than forpassenger cars; but nevertheless, about 10 children are killed each year ridingo

未知题型 教材P386-387：14.7题；14.8题；14.12题。