Thediscussionwassoprolongedandexhaustingthat________thespeakersstoppedforrefreshments.
A.at large B.at intervals C.at ease D.at random正确答案B
Thediscussionwassoprolongedandexhaustingthat________thespeakersstoppedforrefreshments.
A.at large B.at intervals C.at ease D.at random正确答案B