皮皮学，免费搜题
登录
搜题
【单选题】
The new building in our school is for us students. In spite of the noise most of the day, we still feel very happy.A.
built
B.
has been built
C.
being built
D.
to be built
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】You are developing a Windows Communication Foundation (WCF) service that contains the following service contract.[ServiceContract（ ）]public interface IPaymentService{ [OperationContract（ ）] void Recor...
A.
Add the following KnownType attribute to the Employee class and to the Customer class. [KnownType(GetType(Person))]
B.
Implement the IExtensibleDataObject interface in the Person class.
C.
Implement the IExtension(ofType(T)) interface in the Person class.
D.
Add the following KnownType attributes to the Person class. [KnownType(GetType(Employee))] [KnownType(GetType(Customer))]