been是be的过去分词;done是do的过去分词。常见的用法是have done和have been done,have done是主动形式的现在完成式,have been done是被动式的现在完成式。 1、done的含义及相关短语用法 形容词adj.已完成的;煮熟的;合乎礼仪的;合乎规矩的感叹词表示接受建议)动词·做...
34.All that can be done ___. A)have been done B)have done C)has done D)has been done 35.A person beating a drum or blowing a trumpet causes vibrations in the air ___ sound waves. A) calls B) called C) is called D) are called 36.These national parks...
成人高考学位英语备考练习:非谓语动词 一、不定式 (一)基本结构 to do to be doing to have done to be done to have been done 学位英语真题汇编 1、Judging from his manners at the party, he does
3. A deal has been done, but - in the words of Jean-Claude Juncker -implementing it will be a Herculean task. “It is the biggest challenge the EU has ever faced,” he said. It was a sober assessment from the president of the European Commission, w...
(POCT), which can be used in community hospitals, schools and even families for early preliminary screening. The single card and two joint detection of IgM/IgG can effectiv...
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