We generally think of Canada as the northern neighbor of the U.S., however, more than half of the U.S. extending farther north t

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问题 We generally think of Canada as the northern neighbor of the U.S., however, more than half of the U.S. extending farther north than Canada’s southernmost point.

选项 A、extend
B、is extending
C、is extended
D、extends

答案D

解析 本题重点考查主谓一致。however是副词,表示“然而;不过;仍然”,它前面出现逗号,后面应该是具有转折意义的分句,其中画线部分的动词应是谓语动词,不应以非谓语形式的现在分词呈现。四个选项中排除B和C选项,因为陈述事实时,不能用现在进行时,此分句也不涉及被动意义。由于句子主语的中心词是half,形式上是单数,根据主谓一致的原则,应排除A选项,故选D。
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