单项选择题

Each person’s genetic code is unique except （）identical twins.

A. in case of
B. in the case of
C. the point in case
D. a case of

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单项选择题
The neighborhood boys like to play basketball on that （）lot.

A. valid
B. vain
C. vacant
D. vague
单项选择题
He soon received promotion, for his superiors realized that he was a man of considerable （）

A. ability
B. future
C. possibility
D. opportunity
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