高一英语选择题,请教选与不选的原因,谢谢!________the
________ they vised the Science Museum, they showed great interest in everything they saw. A. The frist time B.For the first time C.At frist D.At the frist time
A The frist time 可以引导状语从句， 其他的不可以引导从句 For the first time 第一次 At frist 首先 At the frist time （没有这个短语）