求解答there is little we can do to modify the weather

题目

求解答there is little we can do to modify the weather
( )there is little we can do to modify the weather, we can at least know what kind of weather to expect?
A. .While B.When C Since D. Unless
为什么since 不行呢? since不是也有既然,但是得意思吗、?

答案

你理解错了.此句意为：既然我们不能采取什么来改变天气,我们至少可以知道去预料什么样的天气的.while在句首,译为“虽然”,这是高中的语法重点.since在这里说不通.