单项选择题

The magician picked out several persons () from the audience and asked them to help him with the performance.

A. by accident
B. on average
C. on occasion
D. at random

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单项选择题
Because a circle has no beginning or end, the wedding ring is a symbol of () love.

A. extravagant
B. prominent
C. prescient
D. eternal
单项选择题
They are taught by their superiors that a soldier who () his post in time of war is to be shot.

A. deserts
B. deflects
C. detains
D. throws
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