托福考试辅导：语法讲解（51）
第三节 并列句中的省略并列句中当后面的分句与前面有相同部分时可进行省略，以避免重复，省略时前后要尽量保证结构的平衡
如：I major in history and my brother in chemistry.
He was eager to win her heart, but didn't know how.
TOEFL中有少量题目涉及这一语言现象
例题：
(1)
The photoperiodic response of algae actually depends on the duration of darkness, ----.
(A) the light is not on
(B) and not on light
(C) but is not on the light
(D) is not on light
答案：B
解释：空格前是句子的主谓语, A, D可先排除；正确的搭配是depend on, 而不是is on, C也有误；B是省略了的并列句，相当于and does not depend on light, 符合语法
(2)
Nebraska has floods in some years, ----
(A) in others drought
(B) droughts are others
(C) while other droughts
(D) others in drought
答案：A
解释：空格前是完整的主谓句，逗号不能连接句子，故主谓结构B可先排除；C从句少谓语；D语义不明；A是简略的平行结构，相当于and drought in others (other years)
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