[D91] Linda,make sure the tables____ before the guests arrive .A.be set B.set C.are set D.are setting翻译并分析

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[D91]Linda,makesurethetables____beforetheguestsarrive.A.besetB.setC.aresetD.aresetting翻译并分析[D91]Lind

[D91] Linda,make sure the tables____ before the guests arrive .A.be set B.set C.are set D.are setting翻译并分析
[D91] Linda,make sure the tables____ before the guests arrive .
A.be set
B.set
C.are set
D.are setting
翻译并分析

[D91] Linda,make sure the tables____ before the guests arrive .A.be set B.set C.are set D.are setting翻译并分析
句子的大意是:LINDA,在客人来之前,保证凳子都排好了.
凳子tables 是被排好,这里是要用被动语态,所以肯定是 be+动词被动语态,所以,这里就可以排除掉B,D.
而A选项中,be 只有在虚拟语气中才使用be的原型,而这里并非虚拟语气,所以排除掉A,就只剩下C.