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They have decided to stay at home,___,I think,__,a wise choi

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They have decided to stay at home,___,I think,__,a wise choice
A which,are B which,is C that ,are D that,is
They have decided to stay at home,___,I think,__,a wise choi
答案:B
解析:句意:我认为他们已经决定留在家里这件事情是个明智的选择.
本题考查非限定性定语从句.that不能引导非限定性定语从句,故排除C,D选项;“他们已经决定留在家里”这件事在句中是单数,故答案为B.
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