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英语单选:1.___ we can raise our production remains a problem.

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英语单选:1.___ we can raise our production remains a problem.
A.That.B .How
2If you had told us earlier ___he was,we could have introduced him at the meeting.
A.whom.B.who
3.It has not been announced ___the plane is to take off.
A.where.B.when
并讲讲为什么.感激不尽.
英语单选:1.___ we can raise our production remains a problem.
1.B .How 这是how 引导的名词性从句作主语 是主语从句 .
how是连接副词 作从句中的状语.
如果选 A 意思不全
2 B.who 这是连接代词who 引导的宾语从句 .
who 作从句中的表语.
选项A 是宾格 不能作表语.
who可以代替whom 但whom不能代替who.
注意 作表语的 代词 必须是主格代词 除非口语中 会出现 宾格代替主格的情况如 it's me=it's i.
3.B.when 引导主语从句 作真主语
因为是不定式作表语 表将来 用when 比较符合逻辑.
选项A 语法也正确 但不合常理 故 排除.
再问： 真心谢谢亲。完全看懂。
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