—I thought you were proud of the work I         .

—I’m afraid not .You’d better change it for another.

A．do

B．had done

C．did

D．would

请从所给的五个选项中，选择最合适的一个填入问号处，使之呈现一定的规律性（）

A．A

B．B

C．C

D．D