单选题For how long does the contract include free on-site service?AOne year.BTwo years.CThree years.
单选题
For how long does the contract include free on-site service?
A
One year.
B
Two years.
C
Three years.
参考解析
解析：
根据On-site free. Some suppliers will only do one year, but we provide service for 3可知，Systemco提供三年的免费服务。
根据On-site free. Some suppliers will only do one year, but we provide service for 3可知，Systemco提供三年的免费服务。
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