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15.I came across this old book while I＿＿my room.

• A、clean
• B、will clean
• C、have cleaned
• D、was cleaning

53＿＿

二、词汇与语法知识:共15小题;每题1.5分,共22.5分。从每小题的四个选择项中,选出最佳的一项。
6.-Was the gentleman's name David?
-No.I don't think so,but＿＿,go on,please.

• A、many thanks
  

• B、I'd like to

• C、not at all

• D、never mind