He was sure that he______his wallet in the office.
A.
left
B.
would leave
C.
had left
D.
has left
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【单选题】阅读以下的 C# 代码: prefix="o" ns="urn:schemas-microsoft-com:office:office" ?xml:namespace> class A { public A( ) { Console.WriteLine("A"); } } class B:A { public B() { Console.WriteLine("B"); } } class Prog...