[2002全国] The research is so designed that once nothing can be done to change it. A. begins B. having begun C. beginning D. begun 题目和参考答案——青夏教育精英家教网—

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22.[2002全国] The research is so designed that once ________ nothing can be done to change it.

A. begins

B. having begun

C. beginning

D. begun

答案：A
提示：

题目考察so…that…句型中，that所连接的从句中的时间状语从句（once引导）的谓语动词

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Science can't explain the power of pets, but many studies have shown that the company of pets can help lower blood pressure (血压) and raise chances of recovering from a heart attack, reduce loneliness and spread all-round good cheer.

Any owner will tall you how much joy a pet brings. For some, an animal provides more comfort than a husband/wife. A 2002 study by Karen Allen of the State University of New York measured stress (紧张) levels and blood pressure in people - half of them pet owners –while they performed 5 minutes of mental arithmetic (算术) or held a hand in ice water. Subjects completed the tasks alone, with a husband/wife, a close friend or with a pet. People with pets did

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