Bicycle messengers have existed for a hundred years in New York, and______number reached a peak in the 1990s.

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问题 Bicycle messengers have existed for a hundred years in New York, and______number reached a peak in the 1990s.

选项 A、its
B、his
C、they
D、their

答案D

解析 Their agrees with its referent, bicycle messengers.
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