Two-thirds of the work是is done还是 are done

Two-thirds of the work是is done还是 are done
Two-thirds of the work是is done还是 are done

Two-thirds of the work是is done还是 are done
三分之二 用 are
三分之一 用 is
没其他原因 英国佬规定的
因为我们学的不只是英语 还是他们的‘习惯’
所以这题是 are

is