Instead, there is a new business cycle, tied to the health of the high-tech sector. Riding a wave of technological optimism, the computer, software, and communications industries have grown at a pace far exceeding the rest of the economy over the past three years, helping to _____the expansion.
单选题2018-08-03 03:01:09
0691 A.extent
B.expand
C.extend
D.spread
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