Since chromosonme damage may be caused by viral infections, medical x-rays, and exposure to sunlihgt, i is important that the chromosomes of a population to be tested for chemically induced damage be compared with those of a control population.
A) to be tested for chemically induced damage be compared with
b) being tested for damage induced chemically are compared with
c)being tested for chemically induced damage should be compared to
d) being tested for chemically induced damage are to be compared to
e) that is to be tested for chemicalinduced damage are to be comparable with
答案是A。 b, c, and d肯定不对，但E错在那里？那位指点一下。
E, that is to be, be comparable with不简洁。
和A对比可以发现，这里考了一个虚拟语气，应该用Be动词原型。
感谢版主的回答。A是一个什么动词的虚拟语气，版主能分析一下从句的结构吗？谢谢！！
it is important that + 虚拟原形
it is important that the chromosomes of a population (to be tested for chemically induced damage) be compared with those of a control population. 括号内为定语成分修饰chromosomes
谢谢版主！！！现在明白了。
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