单项选择题


Public and Private Schools in the United States
Religious and private schools receive little or no support from public taxes in the United States, and, as a result, are usually somewhat expensive to 1 . The largest group of religious schools in America 2 by the Roman Catholic Church. While religious schools tend to be 3 expensive than private schools, there are usually some fees.
When there is free education available to all children in the United States, why do people 4 money on private schools Americans offer 5 great variety of reasons for doing so, including the desire of some parents to send their children to schools 6 classes tend to be smaller, or where religious instruction is included as part of the educational program, or because, 7 their opinion, the public schools in their area are not 8 high enough quality to meet their needs. Private schools in the United States 9 widely in size, quality, and in the kind of program that are offered to meet 10 of certain students.
The degree 11 American parents are active in their children’s schools is often 12 to people of other countries. Most schools have organizations 13 of both parents and teachers, usually called P.T.A. for Parent-Teacher Association. They meet together to 14 various matters concerning the school. Parents often give 15 time to help with classroom or after school activities.

A. on which
B. to which
C. which
D. what
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