学测4 书面表达 ( 共 5 题;每小题 1 分,满分 5 分 ) David Watt ,一家网上书店的服务经理,他在回复客户写来的一封投诉信。请按照调解信的要求,将下面方框中给出的五句话填入文中空白处,使该信内容完整。 We assure you that this will not happen again We look forward to serving you again Thank you for your letter of March 10th Yours faithfully We agree that the usual high standards of our services were not met in this instance