单项选择题

The compulsory courses refer to those that you have to take.()

A.simple
B. voluntary
C. practical
D. required

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She finally abandoned her original method and took a new approach().

A.supported
B. promoted
C. gave up
D. tired of
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His motive for working so hard is that he needs money().

A.motivation
B. solution
C. motion
D. nature
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