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as与which均可替代整个主句
在非限制性定语从句中，均可替代整个主句. 如从句在主句之后，两者皆可用；如从句在主句之前，用as。 介词/逗号后, 永远不用that!
They failed in the exam，as/which is natural.
As is known to all，the earth moves around the sun.
He passed the College Entrance Examination, made his parents very happy.
A. as B. which C. that D. it
关系代词as的考查。关系代词as引导限制性定语从句时既可指人又可指物。它只能替代由such，the same等修饰的先行词；as引导非限制性定语从句时，可放于句首，句中或置于句尾，而which则只能置于主句之后。但如果定语从句为否定句或表示否定意义，使用which。As引导的定性定语从句有"正如"之意，而which引导的没有。
〖2010全国Ⅰ〗As a child , Jack studied in a village school ,_____ is named after his grandfather.
A. which B. where C. what D. that
空格设置在名词school后, 且school后有逗号, 此题考查非限定性定语从句。定语从句所修饰的先行词是school, 它在定于从句中做主语, 因此使用关系代词, 选项中的关系代词只有which和that, 由于是非限定性定语从句, 不能使用that, 因此选择A。
〖2010四川〗After graduating from college, I took some time off to go travelling, turned out to be a wise decision.
A. that B. which C. when D. where
此处应为which引导的非限制性定语从句, which代替前边整个句子。句意为： “大学毕业后, 我们休假一段时间去旅游, 这结果证明是一个明智的决定。”
〖2009山东〗Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.
A. who B. which C. when D. that
不论何时遇见她, 她总是用甜美的微笑和我打招呼,这是非常经常的事。考查非限制性定语从句, 从句_________ was fairly often插在主句中的时间状语从句后, 关系代词which可代替主句整个句子的意思并在从句中作主语。答案B。
〖2009辽宁〗They’ve won their last three matches, ________I find a bit surprising
A. that B. when C. what D. which
此处意思是 “他们赢得了最后的三场比赛, 我觉得这确实有点让人意外”, which代替上句 “They’ve won their last three matches”做find的宾语, 选D。A项不能用于非限制性定语从句中, B, C此处没有他们的意思。
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