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问3道英语选择题-Why are you calling so late?You ___ to call at 10.I

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问3道英语选择题
-Why are you calling so late?You ___ to call at 10.It is 10:20.
-I am sorry .My last meeting ran late.为什么选were supposed而不是are supposed?
Seeing that they are very busy,we choose to leave quickly in case we ___ be in the way.为什么选should而不是could?
Only when your identiy has been checked,___ 为什么选will you be allowed in 而不是you will be allowed in 也不是you are allowed in
问3道英语选择题-Why are you calling so late?You ___ to call at 10.I
第一题 You were supposed to call at 10.你应该再10点打电话来的
现在是10:20 所以是在过去的时间 用 were supposed
第二题 in case,lest,for fear that 等引导的状语从句中,表示“一旦,以防,以免”,也有用虚拟语气,谓语形式是 should + 动词原形
此时,这里的should是不能省略的
第三题 only 开头的句子 后面要半倒装,所以后面的助词will要提前
例如还有 Only open the door can you get the object.