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as與which均可替代整個主句
在非限制性定語從句中，均可替代整個主句. 如從句在主句之后，兩者皆可用；如從句在主句之前，用as。 介詞/逗號后, 永遠不用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
關系代詞as的考查。關系代詞as引導限制性定語從句時既可指人又可指物。它只能替代由such，the same等修飾的先行詞；as引導非限制性定語從句時，可放于句首，句中或置于句尾，而which則只能置于主句之后。但如果定語從句為否定句或表示否定意義，使用which。As引導的定性定語從句有"正如"之意，而which引導的沒有。
〖2010全國Ⅰ〗As a child , Jack studied in a village school ,_____ is named after his grandfather.
A. which B. where C. what D. that
空格設置在名詞school后, 且school后有逗號, 此題考查非限定性定語從句。定語從句所修飾的先行詞是school, 它在定于從句中做主語, 因此使用關系代詞, 選項中的關系代詞只有which和that, 由于是非限定性定語從句, 不能使用that, 因此選擇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
此處應為which引導的非限制性定語從句, which代替前邊整個句子。句意為： “大學畢業后, 我們休假一段時間去旅游, 這結果證明是一個明智的決定�！�
〖2009山東〗Whenever I met her, _________ was fairly often, she greeted me with a sweet smile.
A. who B. which C. when D. that
不論何時遇見她, 她總是用甜美的微笑和我打招呼,這是非常經常的事�？疾榉窍拗菩远ㄕZ從句, 從句_________ was fairly often插在主句中的時間狀語從句后, 關系代詞which可代替主句整個句子的意思并在從句中作主語。答案B。
〖2009遼寧〗They’ve won their last three matches, ________I find a bit surprising
A. that B. when C. what D. which
此處意思是 “他們贏得了最后的三場比賽, 我覺得這確實有點讓人意外”, which代替上句 “They’ve won their last three matches”做find的賓語, 選D。A項不能用于非限制性定語從句中, B, C此處沒有他們的意思。
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