the quality of schooling is high,parents are eager not only to send their children to sch

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(答案→)A. Where;keep
B. Where;leave
C. When;keep
D. When;leave
解析：  教学质量高的地方，父母不但迫切地送孩子去，而且还让他们待在那里。因此选择where引导状语从句，keep them there表示“就让他们待在那里”；而leave them there则有“把他们放在那里，不管他们，听之任之”之意，与题意不符。