Last year, five Chinese teachers to a school in the UK to teach the British students in Chinese styl

题干

Last year, five Chinese teachers to a school in the UK to teach the British students in Chinese style for four weeks.

A：was sent

B：were sent

C：have sent

D：sent

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某密闭容器中有X、氧气和二氧化碳三种物质，在一定条件下充分反应，测得反应前后各物质的质量如表．根据表中信息，判断下列说法正确的是（　　）