To learn with success is not a very difficult task of some fundamental prin

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问题    To learn with success is not a very difficult task of some fundamental principles 【C1】______ to be its bases.【C2】______ discussing this subject, four indispensable principles should be mentioned, that is, diligence, devotion,【C3】______ and punctuality.
   All things can be 【C4】______ by diligence. It【C5】______ the foolish, wise, the poor,【C6】______ , and the humble, noble. It produces a wonderful effect.【C7】______ learning, the work of a diligent fool doubles【C8】______ of a lazy wit. Devotion means to set our heart on one thing【C9】______ and【C10】______ all other thoughts. Never 【C11】______ learning another subject【C12】______ one thing.
   Those who often change their studies will never succeed in the long【C13】______ .
   In order to be successful we need devotion. Constancy makes success【C14】______ .
   On the other hand, inconstancy of ten 【C15】______ failure. If we study day after day, there is【C16】______ which cannot be achieved. We should remember a 【C17】______ proverb," Constant drop-ping of water wears away a stone."【C18】______ these there is another rule helpful to one’s【C19】______ , that is, punctuality. The habit of keeping a regular time is【C20】______ to successful learning.
   Work while work; play while play. Every man will certainly become strong and wise if he does these. [br] 【C9】

选项 A、at a time
B、at times
C、at time
D、in time

答案 A

解析 at a time每次。

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