——There so many foreigners in the streets these days.——They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.

题型：单选题题类：模拟题难易度：容易

——There so many foreigners in the streets these days.
——They might be runners in the Yellow River Estuary (入海口，河口) International Marathon.

A、is B、are C、have D、will be