问题

At the age of fifteen she gave up taking piano lessons to _____ her school work.

A:hold on
B:call on
C:put on
D:concentrate on

正确答案是：

同类题型

My friend, Tom, left New York in 1976 and since then

下列词语中注音的字，每对的读音完全正确的一组是（）

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