Question

【题目】For example, there are already robots ____ in factories.
A.work
B.working
C.to work

Answer 1

【答案】B
【解析】句意：举例说明，这已经有机器人在工厂里工作了。此题考查固定句式there be sb doing sth这有某人在做某事。根据句意，应选B。