it's raining hard outside.so we ()stay in the classroom1,mus

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it's raining hard outside.so we ()stay in the classroom1,must2,have to为什么不选1

选择2 ,have to .这个问题主要是考查must 与have to 得用法.
理由:must表示一种主观的需要,而have to表示一种客观的需要,意思是“不得不”.
这个题目意思是说：外面正在下雨,因此我们不得不呆在教室里.问题是因为下雨,是客观上不得不.故选have to.
以下附上Must 与have to得具体用法与区别,
1）表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须……,得……,要……”；由must引起的疑问句,肯定回答要用must或haveto,否定回答要用needn’t或don’thaveto,意思是“不必”；must的否定形式mustn’t表示禁止,意思是“不能,不许”.
We must find a good method to learn computer well.
我们必须找一个学好电脑的方法.
2）表示肯定的猜测,常用于肯定句中,意思为“一定是,必然……”.
注意must表示推断或猜测的几种情况:
Yoursistermustbeadoctorinthishospital.（现在的猜测）
你姐姐一定是这家医院的医生.
haveto/havegotto的用法
1）must表示一种主观的需要,而have to表示一种客观的需要,意思是“不得不”.如：
Ihavetoattendanimportantmeetingthisafternoon.
今天下午我不得不参加一个重要的会议.
Motherisout,soIhavetolookaftertheshop.
妈妈不在家,因此我不得不照看商店.
2）haveto的否定形式是don’thaveto,相当于needn’t.如：
Theydon’thavetobuyacomputeratpresent.
他们目前没有必要买电脑.
3）haveto与have got to常可以互换.

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