推荐回答（2个）
30。(the blacks were) no longer been。。。前后主谓一i致，省略the blacks were 47。因为1后面 he stoped the taxi 是过去时，所以2前面应该用 过去完成时，所以0A不z对。或者是用 现在进行时 做原因状语，选C。 02。听hear的动作发生在相信believe之y前,所以4用完成时。 25。如果用necessary,陈述句是 It is necessary talking to him about it。 变成疑问句只需将is提前: Is it necessary talking ````` 26。whose 是物主代词，这里句子v是问 你知道还有别的朋友a将要参加聚会吗? 正确的组合应该是 who eise's 17。Sorry,Ican't explain it clearly。 10。C选项少3了u一e个lbeen 应该为6has not been desided 42。(Very often )the student leaves the lecture( with notes which do not catch the main points) and ___which_____ be。e hard even for the students to understand。 which 在这里引2导主语从5句，做后面句子a的主语。遇到复合句，重要的是分1析好句子z结构。 15。in speed 在速度上p to`sb 对于i某人m，句意就是 作为2一d个e著名的运动员，格林先生在速度上x无g人x能敌。
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