单项选择题

Ten years after the event,her death still remains a puzzle().

A. mist
B. fog
C. secret
D. mystery

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单项选择题

The traditional paintings are exhibited on the second floor().

A. laid
B. displayed
C. kept
D. stored

单项选择题

Marsha confessed that she knew nothing of computer.()

A. hoped
B. admitted
C. reported
D. answered

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