摘要： To help today’s customers make a choice, a company in New York a video trolley - a supermarket trolley with a video screen to display advertisement and price information. A. has invented B. had invented C. invents D. is inventing
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To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.
A. has invented B. had invented C. invents D. is inventing
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To help today’s customers make a choice, a company in New York _____a video trolley — a supermarket trolley with a video screen to display advertisement and price information.
| A．has invented | B．had invented | C．invents | D．is inventing |