Citing the recent increase in earnings by several computer companies, economists feel that a cycle has begun in which personal computer users, especially corporate consumers, are replacing their PC's with more powerful models.
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Aa cycle has begun in which personal computer users
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Ba cycle for personal computer users has begun in which they
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Cthere is a cycle beginning for personal computer users
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Dit is the beginning of a cycle for personal computer users
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Epersonal computer users are in the beginning of a cycle when they
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正确答案: A