题目

18.
Although the first pulsar,or rapidly spinning collapsed star,to be sighted was in the summer of 1967 by graduate student Jocelyn Bell,it had not been announced until February,1968.
(A) Although the first pulsar,or rapidly spinning collapsed star,to be sighted was in the summer of 1967 by graduate student Jocelyn Bell,it had not been announced until February,1968.
(B) Although not announced until February,1968,in the summer of 1967 graduate student Jocelyn Bell observed the first pulsar,or rapidly spinning collapsed star,to be sighted.
(C) Although observed by graduate student Jocelyn Bell in the summer of 1967,the discovery of the first sighted pulsar,or rapidly spinning collapsed star,had not been announced before February,1968.
(D) The first pulsar,or rapidly spinning collapsed star,to be sighted was observed in the summer of 1967 by graduate student Jocelyn Bell,but the discovery was not announced until February,1968.
(E) The first sighted pulsar,or rapid

提问时间：2021-01-09

答案

18 不知道你是不是还有印象: Although 和 but 是可以互换的. 如果选择用although就不可以用but,同样用but的时候不可以用although.只要记住他们俩是永不见面的就好.21 原句removing是动词名词化. 也就是这是科学家学...