2. 外语
  3. To learn with success is not a very difficult task of some fundamental principles 【C1】______ to be its bases. 【C2】______ discu

To learn with success is not a very difficult task of some fundamental principles 【C1】______ to be its bases. 【C2】______ discu

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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.
【C12】
选项 A、while study
B、for studying
C、studying
D、while studying
答案D
解析 在时间、条件状语从句中，当从句主语和主句主语是一致的，而且从句谓语有be的形式时，可以将从句的主语和be的变化形式省略。
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