When and where the new hospital will be built ______ a mystery.

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问题 When and where the new hospital will be built ______ a mystery.

选项 A、to remain
B、remains
C、remain
D、is remaining

答案B

解析 动名词、不定式和从句做主语时,谓语动词一般用单数。例如:To see is to believe. (百闻不如一见。)Swimming is a good way to keep health. (游泳是个健身的好办法。)Who is her father is not known. (谁是她的父亲尚不得知。)在本句中主语从句做主语,因此动词要用单数形式。
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