og-68

[vivid]

Often visible as somg, ozone is formed in the atmosphere from hydrocarbons and nitrogen oxides, two major pollutants emitted by automobiles, react with sunlight.
A) ozone is formed in the atmosphere from
B) ozone is formed in the atmosphere when
C) ozone is formed in the atmosphere, and when
D) ozone, formed in the atmosphere when
E ) ozone, formed in the atmosphere from

正確答案b

我的問題在於 D) ozone, formed in the atmosphere when
為什麼不能想成是 ozone, which is formed in the atmosphere when...
然後which is省略
formed分詞當連接詞

還有og的解釋說D選少了is 造成fragment
那如果要把is加上
要加在哪裡比較好

[agk99]

如果 D 是省略which is 那本句 就少了主要動詞
請注意 ozone "is" often visible as somg, formed in the ......(這是原句)
選項B是倒裝後的情況

[dibert8]

題目有兩個動詞is, react,但是沒有連接詞,(A)錯了;如果選(D)(E),react必須是單數reacts,所以刪除; 剩下(B) (C)比較長短 => (B)

[dibert8]

Sorry, 看錯了!仔細看,(D)錯在主要子句不見了