Oliver,please ensure the tables __ before the guests arrive.

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Oliver,please ensure the tables __ before the guests arrive.
A.are set B.be set C.set D.are setting
为什么是选C,这句话可以是看成ensure加从句省略that吗?选A.还是此处的ensure引导的是祈使句,要用非谓语动词?所以set与table是被动关系?

这里的set是过去分词,含被动意义,ensure sth. done意思为“确保某事被做”的意思.相同用法还有：have sth. done, get sth. done等.

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