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一道选择题,The door ______, but I don't know why. You'd better ha

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一道选择题,
The door ______, but I don't know why. You'd better have it repaired.
A. isn't open B. isn't opened C. won't open D.mustn't open
选哪个答案呢?并请解释原因!谢谢……
补充:能不能多举两个例子来说明呢?
一道选择题,The door ______, but I don't know why. You'd better ha
选择C.
open是形容词 ,没有opened的形式
同时,will除了表示将来时,还能表示习惯性伙动作特征.
所以选C.
He will never let anybody know what he is doing.这个就不是表将来.