高一英语语法-----Steve made a reservation already.-----_____ he ch

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高一英语语法
-----Steve made a reservation already.
-----_____ he change his mind,he can cancel it.
A.Should B.Would C.If D.So
为什么不选C选A
If only she____of Aunt Ruth
A.was not terribly so frightened B.were not terribly so frightened
C.be not so terribly frightened D.were not so terribly frightened
为什么选D不选C
The chairman requestes that______
A.the members studied the problem more carefully
B.the problem were more carefulnessly studied
C. the problem could be studied with more care
D. the members study the problem more carefully
为什么选D不选A
The idea is that we ______ ac unmanned spacecraft to explore the planet first.
A. will send B.had sent C.send D.be sent
为什么选A不选C
要详细哦谢谢了

第一个题：should是万一的意思,如果选If 则句子是条件状语从句,后面的主句应该是he will cancel it.
第二个题：If only 是虚拟语气,“要是……多好啊”,后面要用虚拟语气,虚拟语气里be动词要用were
第三个题：动词 request 后应该用,should 可以省略
第四个题：此题同第三题相似,也是should+动词原形,should 可以省略,只不过是动词换成名词了,如果第三题的request 作名词用法也是一样的

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