单项选择题

He is Jack of all （）and master of none.

A. trades
B. businesses
C. fields
D. areas

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单项选择题
There are so many people talking that I just could not （）on my study.

A. attract
B. absorb
C. concentrate
D. detach
单项选择题
11（）

A.chance
B.purpose
C.opportunity
D.basis
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