Industrial output has grown by an average of（）annually since tariff barriers were eliminated in 1977.<br>A:3%<br>B:5%<br>C:8%<br>D:10%

Industrial output has grown by an average of（）annually since tariff barriers were eliminated in 1977.
A:3%
B:5%
C:8%
D:10%

出自：00522《英语国家概况》

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