6.The number of students who failed the chemistry examination ( )to fifteen.A.have increasedB.has increasedC.is increasedD.are increasing

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6.The number of students who failed the chemistry examination ( )to fifteen.A.have increasedB.has increasedC.is increasedD.are increasing
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6.The number of students who failed the chemistry examination ( )to fifteen.A.have increasedB.has increasedC.is increasedD.are increasing
6.The number of students who failed the chemistry examination ( )to fifteen.
A.have increased
B.has increased
C.is increased
D.are increasing

6.The number of students who failed the chemistry examination ( )to fifteen.A.have increasedB.has increasedC.is increasedD.are increasing
B the number of表单数,has表示已经

B The number of 谓语用单数

b

B 主语是the number 时态用完成时