The number of teachers in this school_______________ unknown.1.are 2.is being 3.is 4.are being

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Thenumberofteachersinthisschool_______________unknown.1.are2.isbeing3.is4.arebeingThenumberofteacher

The number of teachers in this school_______________ unknown.1.are 2.is being 3.is 4.are being
The number of teachers in this school_______________ unknown.
1.are
2.is being
3.is
4.are being

The number of teachers in this school_______________ unknown.1.are 2.is being 3.is 4.are being
is
the number教师的数量.表示一个整体.后面用单数

is 主语是教师的人数

is 主语是the number

is