英语考试题目,请求您的帮助学长,我这几道题不明白为什么这样做,请您帮忙具体解析,感谢您的雪中送炭!选择1.Lily al

英语考试题目,请求您的帮助
学长,我这几道题不明白为什么这样做,请您帮忙具体解析,感谢您的雪中送炭!
选择
1.Lily always has _______toothache because she likes eating sweet food.(这道题我选的D,正确答案是A)
A a B an C the D /
2.The train to Beijing leaves_________eight o'clock .Let's hurry.（这道题我选的D,正确答案是C）
A in B on C at D from
改写句子
James spent all the the evening on his homework.(保持原句意思不变)（这道题为什么要用过去式,
_______ _______James all the evening to do his homework.