— How is Emmy?    

— I have no idea. She hasn't written to me ______ we met last time.  [ ]

A. since

B. while

C. as

D. before

全面检验具体项目有宏观、保温层个热层衬里、壁厚、（）、埋藏缺陷、材质、（）、强度、（）等。