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题库 / OG2021-SC-872
Scientists say that, by bathing the skin cells in extracts of immune cells, that human skin cells in a test tube are made to behave as if they were immune system cells.
that human skin cells in a test tube are made to behave as if they were
that human skin cells were to behave in a test tube as if they were
human skin cells in a test tube were made to behave as if
they have made human skin cells in a test tube that were behaving as
they have made human skin cells in a test tube behave as if they were
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这题主要考句意，say that后无需重复，简单排除AB。
D选项：问题一，定语从句原则就近修饰，此处容易产生歧义修饰tube；问题二：句意错误，原本意思应该是科学家make cells behave-make sb do，有很强的约束性。 D中变成了科学家make cells in a test tube, 科学家在test tube里面做细胞。
C选项：问题一，be made to迫使某人做某事不符合句意，另外gmat能用主动的情况下永远都不prefer被动；问题二，as if后面要接句子，通常要接虚拟语气，似乎，好像....
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