我国现行规定的证券买卖委托有效期，分当日有效和约定日有效两种。( )
参考答案：错
It was not until midnight that _____ the camping site. [ ]
A. did they reach
B. they had reached
C. had they reach
D. they reached
工程咨询的服务对象包括贷款银行，银行要求咨询工程师（投资）不受（）的影响，提出客观、公正的报告。
A．资金来源和融资渠道
B．环境和生态保护
C．项目规模和技术
D．业主和项目当事人
