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标题: [求助]大全648题 [打印本页]

作者: qiuqiaomm 时间: 2006-10-4 08:41 标题: [求助]大全648题

1. Since chromosome damage may be caused by viral infections, medical x-rays, and exposure to sunlight, it 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

(D) being tested for chemically induced damage are to be compared to（A）

(E) that is to be tested for chemically induced damage are to be comparable with

以前好象看懂过，现在怎么又不明白了，为什么要用虚拟语气？

作者: insonbia13 时间: 2006-10-4 14:12

it is important that do/be动词原形，不可加should.

作者: qiuqiaomm 时间: 2006-10-5 13:45

it is important that, 这里类似important的词还有什么，要用虚拟语气的，能否赐教，谢谢！

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