问题补充:
they visited the Science Museum,they showed great interest in everything they saw.
A. The first time
B. For the first time
C. At first
D. At the first time
答案:
A. The first time
B. For the first time
C. At first
D. At the first time
解析:考查连词。句意:他们第一次参观科技博物馆时,对所看到的一切表现出很大的兴趣。The first time 第一次做某事的时候,是连词。For the first time第一次,做状语;at first 首先;D项是错误的用法。所以选A项。
考点 :考查连词