21．—Did Susan visit you again ________ next year?
—No，it was almost ten years before she came to see me ________ second time.
A．the；a B．the；/ C．/；the D．/；a
22．—May I remind you that a Mr. Zhang is waiting downstairs，sir?
—Oh，dear！I ________ about it.
A．forget B．forgot C．have forgotten D．had forgotten
23．Now my hometown is not at all ________ a traveler who visited it ten years ago can expect.
A．that B．what C．which D．where
