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题库 / GMATLA-SC-45
Doctors hope that one day the body's master cells, called stem cells, can be directed to grow in organs or tissues appropriate for transplant, use them to test drugs and potentially toxic chemicals, and may study them to gain insight into basic human biology.
transplant, use them to test drugs and potentially toxic chemicals, and may study them
transplant, using them to test drugs and potentially toxic chemicals, and studied
transplant, used to test drugs and potentially toxic chemicals, and studied
a transplant, use them for testing drugs and potentially toxic chemicals, and for studying
a transplant, used to test drugs and potentially toxic chemicals, and may study them
题目分析：
本题十分简单，考查了基本的平行原则。意思是：科学家希望能利用干细胞做些什么，那干细胞们就得 被 科学家研究、利用、检测。因此，direct、use、study三者应该保持语法的平行，答案为(C)。
选项分析：
略。
to do 表目的状语时，要看主语（被动要看语义上的主语）和谓语的搭配是不是ok的，譬如物作主语不能发出意向动作
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