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

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单项选择题
The letter seemed （） by a child.

A. to have written
B. to write
C. to be writing
D. to have been written
单项选择题
A Dream of the Red Chamber is said （） into dozens of languages in the last decade.

A. to have been translated
B. to translate
C. to be translated
D. to have translated
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