从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
6．Not until the glass looked almost new___ cleaning it．
A．he stopped B．did he stop C．stopped he D．had he stopped
7．When finally I got to my office, I was wet through,___．
A．exhausted and discouraged B．exhausted and discouraging
C．exhausting and discouraging D．exhausting and discouraged
