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Mr Smith has bought a little house in the country, around _________ some green trees.
A. which is B. it is C. which are D. them are
【分析】此題容易誤選A或B，將A、B中的 which 和 it 誤認為是其后句子的主語。其實，此題的最佳答案為C，around which are some green trees 是一個由“介詞+which”引出的非限制性定語從句，而在該從句中，主語是 some green trees，around which 是表語，所以句子謂語應用are，而不是 is。請看類例：
Among these people was a foreigner from
On the top of the tree were some birds. 樹頂上有一些鳥。(句子主語為 some birds，on the top of the tree 是表語，所以謂語動詞用復數 were)
The police found a large box under his bed, in which were some sex books. 警察在他的床底下找到一只大箱子，里面裝的是一些黃色書籍。(in which were some sex books 為非限制性定語從句，在該從句中，in which 是表語，some sex books 是主語，所以謂語動詞用復數were)
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