历年托福考试语法真题全面解析29
21. Mahogany is often considered the finest cabinet wood because they has most of the qualities desired for furniture making.答案：C
测试点：代词数的一致。
分析：谓语has为单数形式，主语应为相应的单数代词it。
解题要点：代词数的错用是TOEFL常考题型．注意划线代词是否与它所指代的名词单复数一致.
22. The situation comedy has proved to a remarkably durable commercial television format.
答案：B
测试点：习语.
分析：prove+to be+名词是固定结构，此处缺be.
23. Calcium, the most abundantly mineral in the body works with phosphorus in maintaining bones and teeth.
答案：A
测试点：词性.
分析：副词abundantly不能修饰名词，此处要用形容词abundant。
解题要点：见到划线的-ly结尾的副词，要留意是否是形容词的误用.
24. Soil science begun with the formulation of the theory of humus in1808.
答案：A
测试点：不规则动词的词形变化
分析：begun是过去分词，不能单独作谓语。应用过去式began。解题要点；划线的不规则动词，要注意其形式变化是否用错．TOEFL中常见的有，begin-began-begun，stand-stood-stood，set-set-set等.
25. Scholars tend to cite 1831 as the started of the United States abolitionist movement.
答案：C 测试点：词性。
分析：started是动词形式，而冠词the后须用名词．应为start.
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