Under no circumstances ______ be left alone at home.

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问题 Under no circumstances ______ be left alone at home.

选项 A、a three-year-old child should
B、should a three-year-old child
C、a three-year-old child should not
D、should a three-year-old child not

答案B

解析 此句为倒装句。当含有no的介词短语位于句首作状语时句子需要倒装。例如:At no time will China be the first to use nuclear weapons.中国绝不会首先使用核武器。类似的介词短语还有,by no means,in no way,in no case等。此外,由基数词和名词构成的合成词,如用连字符“-”,则名词用单数。如:a ten-mile walk十里路,a two-year old child一个两岁大的孩子。
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