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She___look after her sister because her mother isn't at homeA.have to B.has to C.must D.must to
题目详情
She___look after her sister because her mother isn't at home
A.have to B.has to C.must D.must to
A.have to B.has to C.must D.must to
▼优质解答
答案和解析
must表示你建议某人要做某事,带有较强烈的主观色彩,只是你自己的想法,没有什么根据的.have/has to表示的必须是因为事情有这个必要所以一定要做,它带有较多的客观色彩,表明你这样认为是有一定的客观依据的.这里because引导的原因状语从句就是一个客观依据,又因she用第三人称单数,选B.
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