问几道英语题阿,

题目

问几道英语题阿,
1.—_____will the concert begin?
—______seven o'clock.
A.how long;not until B.hong long;until C.how soon;not until
D.how soon;until
2.We'll do what we can _______you with your English study.
A.to help B.were left C.had left D.left
3.Alice has been in China for several years.She _____be a big girl now.
A.need B.must C.can D.may
这集体都拿不准,谢谢回答,（选什么,为什么）

答案

C对将来时间提问 how soon. 回答 应该用not until 其实是省略了,原话应该该是：The concert will not begin until 7:00. 不可以选D. 如果想说七点才开始,应该是:It will begin at 7:00.until 不能那么用.
A To help 在这里做的是目的状语.和can 无关.应该把what we can当做一个整体.
B 表示肯定的猜测.意思是：她现在是个大姑娘了吧.