Dear Mr. Liu, We have been（1）with you for the past three years, and during that time, our accounts were （2） by letter of credit.（3）, when we began our trading association with you, you mentioned that once a trading association was （4）,our payments would be made by 60-day bill of （5）,documents against payment. We feel that sufficient time （6）passed to allow this arrangement to be effected. Please let us know before we（7）our next order （8） these new payment terms are acceptable. We enclose details of two referees, （9）may be approached should you require trade references, and look forward to （10）from you. Yours sincerely, David Arnold Chief Buyer Encs.
 

Which option should be filled in the bracket（2）？（）

A．cleared
B．clearing
C．cleaned
D．cleaning