现在完成时就是指:过去发生或已经发生的动作对现在造成的影响或结果。其基本构成是:have/has+done;过去完成时是指:在过去某个特定时间点或动作之前就发生的行为,即过去的过去。其基本构...
过去将来完成时:(would have done) 例:I believed by the end of that year an advanced version of that software would have been developed, but I was wrong. 我坚信到那年年底为止,那个软件的新版本将被开发出来。但是我错了。 16 过去将来完成进行时:(would hav...
to have been done 学位英语真题汇编 1、Judging from his manners at the party, he doesn’t seem ___ much education. A. to receive B. to be receiving C. to have received D. to have been received 2、The magnificent museum is said___ about a hundred yea...
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...
26. Doctors have long been puzzled by . A. why red meat is harmful B. how beneficial fish are C. what makes fish healthful D. how red meat is replaced 27. We can learn from the passage that . A. human beings get omega-3s from their food ...
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