______scientistshavelearnedalotabouttheuniverse,thereis...
问题详情:
______ scientists have learned a lot about the universe, there is much we still don't know.
A. Once B. Since C. Though D. Unless
【回答】
C
考点:考查状语从句
知识点:连词
题型:选择题
问题详情:
______ scientists have learned a lot about the universe, there is much we still don't know.
A. Once B. Since C. Though D. Unless
【回答】
C
考点:考查状语从句
知识点:连词
题型:选择题