Online customers will get a 20 percent discount on first and business class______.

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问题 Online customers will get a 20 percent discount on first and business class______.

选项 A、upgrade
B、upgrades
C、upgraded
D、upgrading

答案B

解析 first and business class——在句子中充当on的宾语，所以空格处应当是名词，这样答案就在(A)项和(B)项中。upgrade表示“升级”，是可数名词，因此复数形式的(B)项是正确答案。

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