请问以下句子是什么语法现象?
问题描述:
请问以下句子是什么语法现象?
once the fourth biggest city in the united stats,st.louis has now become the 24th largest city.
答
主语从句,行式主语.现在完成时...
请问以下句子是什么语法现象?
once the fourth biggest city in the united stats,st.louis has now become the 24th largest city.
主语从句,行式主语.现在完成时...