All the doors and windows are required ——— to make sure that

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All the doors and windows are required ——— to make sure that they are all locked
A checking B to check C being checked D to be checked 为什么选择D
所有的门窗都要求被检查来保证都锁了，require to be done是否可以将be提前变为 be required to be done???
打错了，将be 提前变为 be required to do

你说的前者是错误的 require 是及物动词必须 require sb/sth to do
被动式就是sth/sb be required to do
这里 be required to be done 应该可以这么理解因为check 是及物所以被动式如果这里是不及物动词那就 be required to do 了
拙见我其实也不太明白原先极肯定被你一问也有点懵了

1.We should make sure that all the windows and doors were __ Make sure that you all the doors and windows before you leav ————,leave the room last ought to make sure that windows are all the doors and windows in the house are open to( ) the ol make sure that all the doors (lock) when they leave The house ________ doors and windows are all closed is for s 19.They shut all the windows and doors of the classroom to _ there are paper cuts on the doors and windows是什么意思来看看这道英语语法题＿＿＿＿that you close all the doors and windows befor make sure that the electricity is turned off and the windows decorate the doors and windows with paper Check all connections and make sure all devices are on. To c