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

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问题 Barbara ______ in doing it again though she had failed more than a dozen times.

选项 A、insisted
B、persisted
C、assisted
D、consisted

答案B

解析 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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