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when he ( )the door ,he found his keys were nowhere.A opened B would opened C was to opened为什么A不可以 不是时间状语从句中用一般时代替将来时么 还有为什么B不可以啊

题目详情
when he ( )the door ,he found his keys were nowhere.
A opened B would opened C was to opened
为什么A不可以 不是时间状语从句中用一般时代替将来时么 还有为什么B不可以啊
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答案和解析
be to do sth 正要做什么
would do 愿意做什么
们还没开,不能用A