Question

求助几道单选题+讲解

1.____modeling business is by no means easy to get into, the good model will always be in demand.
A.While B.Since C.As D.If
2.It was evening____ we reached the little town of Winchester.
A.that b.until C.since D.before
3.—You haven't lost the ticket,have you?
—___.I know it's not easy to get another one at the moment.
A.I hope not. B.Yes,I have C.I hope so D.Yes, I'm afaid so
4.Sientists think that the continents____always where they ____today.
A.aren't;are B.aren't;were c.weren't;are D.weren';were

答案是ADAC

希望大家解答，谢谢！

Answer 1

1.A 根据句意，前后两句是让步关系，选择尽管含义，所以是A
2.D 由句意得知，意思“才”，选before,如果用until 就要有not，且放在evening之前，此句不是强调句，因此不用that
3.A 反义疑问句，你没有丢票是吗？回答是我丢了，（由后句可知），如果用肯定形式回答，就是没有丢
4.C 这是一种对将来时态的虚拟，所以用过去时，后面是today，用现在时，这是混合虚拟的用法

Answer 2

while在这是指当的意思
before是在什么之前
你还没有遗失票，是吗 ? 我希望不我知道此刻拿另外一张票不容易
选weren't是指过去，而最后一个词是today,所以用现在时