－Have you made ______ apology to your mother?

－Yes. I regretted speaking to her in ______ rude manner.

A．an; a

B．an; /

C．the; a

D．/ ; the

用长为20米的铁丝围成一个长方形方框，使长为6.2米，宽为x米，则可列方程为（　　）

A．x+2×6.2=20

B．x+6.2=20

C．2x+6.2=20

D．2（x+6.2）=20