单选题
Barbara ______ in doing it again though she had failed more than a dozen times.
A、
insisted
B、
persisted
C、
assisted
D、
consisted
【正确答案】
B
【答案解析】
[分析] persist in...“坚持……”；insist on(upon)...“坚持”；assist in...“在……帮忙”；consist in“存在于……”。根据题意，只有B正确。
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