21. GWD17-Q21:

Medicare, the United States government’s health insurance program for the elderly and disabled, covers the full cost of home health care, but not with other nonhospital services where 20 percent of the costs must be paid by beneficiaries.

1. but not with other nonhospital services where 20 percent of the costs must be paid by beneficiaries
2. but not of other nonhospital services, making beneficiaries pay 20 percent of the costs
3. but not of other nonhospital services, for which beneficiaries must pay 20 percent of the costs

4. which is unlike other nonhospital services in that 20 percent of the costs must be paid by beneficiaries
5. which is unlike other nonhospital services that make beneficiaries pay 20 percent of the costs

正确答案选C,请大家帮忙解释以下......谢谢了///....

a 似乎没有大错，但其实介词错了，根据一致性原则前面是cover cost of,后面变成

了cover cost with.在这个意思上面没有cover with的用法.能用主动语态的用了被动语态。

b 选项中没有情态动词，改变了原句意思

c 正确

d which非限定性定语从句指代不清；in that这个词现代文中几乎灭绝了；用了被动语态

e which非限定性定语从句指代不清；选项中没有情态动词，改变了原句意思。