It is essential that these application forms ___back as earl

It is essential that these application forms ___back as earl It is essential that these application forms ________ back a 1.It was essential that the application forms ____________ba It was essential that the application forms()back before the 1.It was essential that the application forms __________ 单选题：It was essential that the application forms ___ back bef it was essential that the application forms be send back bef 8.It was essential that the application forms ____ back befo It is essential that these applicaton forms____backas soon a 1.It was essential that theapplication forms ____________bac it is essential that all these features be checked twice.这句话 几道CET4的题目It was essential that the application forms____back