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The Story of Tea
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单项选择题
Contrast may make something appear more beautiful than it is when ______ alone.
A. seen
B. is seen
C. to be seen
D. having been seen
单项选择题
Tests have proved that caffeine affects the body by increasing the heart rate and rhythm, which ______affects the circulatory system.
A. in turn
B. in return
C. turn back
D. as a result
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