I'd like to go hiking with you tomorrow,but I_.Why?Because my sister is ill and I_take care of her in hospital.A.shouldn't,must B.mustn't,must C.can't,have to D.shouldn't,should要说明理由的

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I'd like to go hiking with you tomorrow,but I_.Why?Because my sister is ill and I_take care of her in hospital.A.shouldn't,must B.mustn't,must C.can't,have to D.shouldn't,should要说明理由的
I'd like to go hiking with you tomorrow,but I_.
Why?
Because my sister is ill and I_take care of her in hospital.
A.shouldn't,must B.mustn't,must C.can't,have to D.shouldn't,should
要说明理由的

I'd like to go hiking with you tomorrow,but I_.Why?Because my sister is ill and I_take care of her in hospital.A.shouldn't,must B.mustn't,must C.can't,have to D.shouldn't,should要说明理由的
第一个空填can't
can能够,can‘t不能
should是应该的意思,shouldn't是不应该的意思,这里不合适
must是必须,mustn't是不必须,放到句中也不合适
第二个空其实must和have to都是可以的,should也说得过去.
但是have to更合适一些,它是不得不的意思.
译:
我想明天和你一起去远足,但是我不能去
为什么?
姐姐病了,我不得不在医院照看她.
就是说本来可以去的,但是不得不留下来.
综上,应该选C

c 人家邀请你远足地的话,基于礼貌应先达我愿意但由于某种特殊的原因我不能去 2. 与 must都表必须但 have to 是不得不,是客观原因逼的,而 must 是必须,是主观原因

选C,因为前一句是说,我想明天和你一起去爬上,但是我不能。用can't表示不能。shouldn't是不应该,mustn't是禁止,不符合题意。
第二句是回答原因:因为我的妹妹生病了,我得去医院照看她。用have to表示不得不的意思, must 是必须,should 是应该,都不符合题意。...

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选C,因为前一句是说,我想明天和你一起去爬上,但是我不能。用can't表示不能。shouldn't是不应该,mustn't是禁止,不符合题意。
第二句是回答原因:因为我的妹妹生病了,我得去医院照看她。用have to表示不得不的意思, must 是必须,should 是应该,都不符合题意。

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