Over the past 16 years, the population of the Amish People _____ to 230,000 with roughly 5 children per family.
A. had nearly doubled
B. has nearly doubled
C. nearly doubled
D. has nearly been doubling
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How was the journey?Tiring. I caught the train at the last second, but all the seats ____. I stood all the way.
A. had been occupied
B. had occupied
C. would occupy
D. would be occupied
He ____ football regularly for many years when he was young.
A. was playing
B. played
C. has played
D. had played
网络经济中的竞争呈现出新的特点，主要有：（）
A. 门槛降低导致竞争更加激烈
B. 竞争使产品的生命周期缩短
C. 竞争方式更趋向于合作式竞争
D. 竞争从产品差异化走向标准化
网络市场与传统的市场类似，呈现垄断特征的原因主要有：（）
A. 资源独享
B. 规模经济
C. 政府扶持
D. 人才竞争
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