单项选择题

In the long run, English learning, difficult as it is, is ______ to a learner in his or her career development.

[A] profitable
[B] advantageous
[C] prominent
[D] rewarding
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单项选择题
Part of them once again ______ to their former prejudices in regard to Lincoln.
[A] reversed
[B] reverted
[C] recurred
[D] restored
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In his ______ to further his knowledge of the universe, man has now begun to explore space.
[A] attempt
[B] expedition
[C] trial
[D] chase
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