题目信息
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.
A:transplant, use them to test drugs and potentially toxic chemicals, and may study them
B:transplant, using them to test drugs and potentially toxic chemicals, and studied
C:transplant, used to test drugs and potentially toxic chemicals, and studied
D:a transplant, use them for testing drugs and potentially toxic chemicals, and for studying
E:a transplant, used to test drugs and potentially toxic chemicals, and may study them
参考答案及共享解析
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已选答案：
正确答案：
C:transplant, used to test drugs and potentially toxic chemicals, and studied
除了C，其余选项中的them指代不清楚，产生语义模糊有歧义。
c中不存在指代不清的问题，而且can be directed，并列 (can be) used,并列 and (can be) studied
正确答案为C。
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