There ought to be less anxiety over the perceived risk of getting cancer than ____ in the public mind today.
A. exists B. exist C. existing D. existed(全国研考,95-2)
答案为 A(exists)。但这种答案使我丈二和尚摸不着头脑。后来查阅了谢振元教授主编的《研究生入学考试复习指南(1997)》(中国人民大学出版社)。该书解答说：“本句主语为‘anxiety’，现在时第三人称只能选(A)exists，才能使主谓一致起来。”读后仍然不明白。anxiety 是主句的主语，than 从句的主语是哪个词项呢？
在你耐心地读完 than 之后,你的疑惑就会烟消云散。我相信你做下面的英语试题也就没有困难了:
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The project requires more labor than ____ because it is extremely difficult. A. has been put in B. have been put in C. being put in D. to be put in(全国研考,92-28)
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We often advise him not to drink more wine ____ is good for his health. A. as B. than C. that D. but(全国六级,93.6-57)
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The experiment requires more money than ____. A. have been put in B. being put in C. has been put in D. to be put in(全国英语专业四级,02-49)
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The indoor swimming pool seems to be a great deal more luxurious than ____. A. is necessary B. being necessary C. to be necessary D. it is necessary(全国英语专业四级,98-44)