单项选择题

In the United States, primary education requires______years.

A. five

B. six
C. seven

D. four
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单项选择题
Which of the following words best matches the meaning of the word oscillate in Paragraph 9
A. Move back and forth.
B. Go up and down.
C. Climb high and low.

D. Shift right and left.
填空题
ourselves
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