单项选择题

Barbara () in doing it again though she had failed more than a dozen times.

A. consisted
B. insisted
C. persisted
D. assisted

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() people take holidays in summer.

A. Most
B. Most of the
C. Most of
D. The most
单项选择题
There's a tiny () in the diamond: that's why the ring is so cheap.

A. deformity
B. error
C. flaw
D. scar
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