1.water____changed into gas at a high temperature.
A.must be B.were C.can be D.should be
2.my aunt_________at least thirty-five years old this year.
A.must be B.can be C.would be D.will be
3.i will have my car______.
A.repairing B.repaired C.to repair D.to have repaired
4.she______leave rubbish here. she is not___to do so.
A.can't...allow B.can't...allowed C.can...allowed D.may...allow
劳烦告知解题原因。。谢谢~
參考答案:1,c水能变成水蒸气，这是一个常识问题，没必要用过去时。其他的说水必须变成蒸汽说不通
2，a 句中的at least是至少的意思，说了这个词就说明“我”不知道她到底具体多少岁，所以整个句子用一个猜测的语气，must be 在这句中就是表猜测
3， B have sth done 表示把什么东西怎么样，车要修肯定是人修，车只是被修
4，B，她不能把垃圾丢这，她不允许这么做，允许是她被允许，所以要用被动
