2道英语选择题，英语高手请进

Question

The factory produced ()tractors in 1988 as the year before.
A.as twice many B.as many twice
C.twice as many D.twice many as
()it was raining hard,we had to be indoors.
A.Till B.As C.Since D.For
最好有解析

Answer 1

C 固定结构
B as因为
as，because，since都可以表示因果关系，连接原因状语从句，含义是"因为，由于"，但它们有区别：because表示的语气最强；as一般放在句首，语气较弱，较口语化；since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"。例如：

(1) He will succeed because he is in earnest.他一定会成功，因为他很认真。

(2) Since you are so sure of it he”ll believe you.既然你对此如此有把握，他会相信你的。

(3) As rain has fallen, the air is cooler.因为下过雨，空气比较清爽。

Answer 2

C/B