GWD30-16，20

Researchers are using computer images to help surgeons plan difficult operations and to develop programs that will work for doctors and nurses in the same way that flight simulators do for pilots, letting medical personnel practice their techniques and test their reflexes before they ever see a patient.

1. plan difficult operations and to develop programs that will work for doctors and nurses in the same way that flight simulators do
2. plan difficult operations and develop programs to work for doctors and nurses the same way as with flight simulators
3. to plan difficult operations and to develop programs that will work for doctors and nurses like flight simulators
4. plan difficult operations and in developing programs to work for doctors and nurses the same way as flight simulators
5. to plan difficult operations and developing programs that will work for doctors and nurses like flight simulators do

答案为何不是C而是A？

1. of which type there are 200,000 worldwide, can interfere with pacemakers and that
2. of which, worldwide, there are 200,000 of that type, and which can interfere with pacemakers, and
3. of which type there are 200,000 worldwide, they can interfere with pacemakers and
4. 200,000 of which type exist worldwide, interfering with pacemakers, and
5. 200,000 of that type existing worldwide and can interfere with pacemakers, and

答案为D，那第一句的动词在哪儿呢？

GWD30-16，20

16:因为develop是和help并列的，如果是C，就无法分清到底是和help还是plan并列

20:我觉得A更好