But as the amount of data and the demand for them , these electronic highways have become clogged. The solution: fiber optic. A. are increasing B. increased C. have increased D. would have increased

But as the amount of data and the demand for them , these electronic highways have become clogged. The solution: fiber optic.

A. are increasing
B. increased
C. have increased
D. would have increased

出自：石家庄职业技术学院-会计学-公共英语_1

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