Learning how to________on one thing is one of the important ways to success.

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问题 Learning how to________on one thing is one of the important ways to success.

选项 A、control
B、encourage
C、display
D、concentrate

答案D

解析 空格后面有介词on。concentrate on是固定搭配,意为“全神贯注于,把注意力集中于”,符合句意要求。A项control意为“控制”,B项encourage;意为“鼓励”,C项display意为“展示”,这三项后面都不接介词on。
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