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.
语法 Sentence Correction-3641
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钥匙Eric 2016-05-21 20:34:41
主句had not been过去完成时 从句was 一般过去时 但主句发生在1968年，从句在1967年 主句发生在从句之后 不应该用过去完成时 一般过去时就可以满足
蓓蓓8018 2016-08-09 15:23:22
過去完成式發生的時間是1968但過去式完成時間是1967年不合邏輯。 the first pulsar was in the summer of 1967是錯的，應該是was observerd in the summer of 1967
liqijie3242656 2014-08-02 13:14:30
it指代不清，语法上指代 pulsar，但pulsar逻辑上不能被announced
zzsheng 2016-11-08 14:17:57
it 指代问题，句意上应该指代discovery
DHJ740 2016-11-06 10:47:06
句子主语是pulsar，系动词was，后跟时间状语，被动语态谓语结构不完整(by…没有受动对象)，不符合逻辑;it指代不清楚(语法上讲it应该指代pulsar，但pulsar不能be announced，只能是discovery be announced)。
金子0913 2016-07-16 19:52:23
was 后面没有宾语，介词短语不能做宾语，且不应该用过去完成时
xx2312345X 2016-06-02 18:06:10
Although the first pulsar, or rapidly spinning collapsed star, was sighted in the summer of 1967 by graduate student Jocelyn Bell, it had not been announced until February, 1968. 把to be 改成was,把后面的was去掉才对
jessicachow 2016-05-17 17:14:38
句子简化后：the first pulsar was in the summer of 1967...含义错误。1967早于1968，1968不能用had been announced.
annie654 2016-05-15 16:28:53
简化句子的结构，变成了the first pulsar was in summer of 1967，意思是不对的
ypheroin 2016-01-13 17:23:19
pulsar was by JB, 被动语态少真正的谓语动作 2. it (pulsar) be announced不合逻辑，discovery of pulsar be announced才对
clariceyq 2016-01-10 04:31:10
the first pulsar was in the summer (X)
