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英语 语法填空scientists are convinced _____ the positive effect of

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英语 语法填空
scientists are convinced _____ the positive effect of laughter.
john thinks it won not be long______ he is ready for his new job.
Scientists are convinced _of_ the positive effect of laughter.
John thinks it won not be long_before_ he is ready for his new job.
be convinced of 是一个短语.
It's not (won't be) long before...是一个句子的结构.
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