单项选择题

Learning a foreign language can be very frustrating, but it（）

A. pay back.
B. pay for.
C. pay up.
D. pay off.

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I received a （） letter of acknowledgement.

A. hysterical
B. grievous
C. gracious
D. sensible
单项选择题
（）, work songs often exhibit the song culture of a people in a fundamental form.

A. They occur where they are
B. Wherever they occur
C. Occurring where
D. Where do they occur
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