从每题所给的A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21、 Lu’an you see today is quite different city from what it used to be.
A．The, / B．/ ,The C．The, a D．A, a
22、—Bruce, please don’t open the door. It’s cold.
—Pardon?
—I you not to open the door.
A．will tell B．had told C．have told D．told
23、The two years of study under the famous professor his mind and improved his character.
A．shaped B．requested C．supported D．reflected
