A number of students in this class _____ to Beijing once or twice A.were B.have been为什么选B?A不行吗

a number of students还是a number of the students a number of the students A number of students,请问 A number of 与the number of students有什么不同 选择：A number of students _____ comehavehaving number of students 中文 The number of students （）students like singing the song A number of B a number of C thenumber of [ ]of students [ ]to go to beijing universitya a number ,wants b a number ,wantc the number ,wantsd the number,want A number of students _____interested in computer games. A large number of students ___to school in the morning Look!A number of students ____(be) on the playground. Now,Mr LI is checking_____the students.（a number of ,the number of） ( )students( ) learning English hard.A.The number of;is B.The number of;are C.A number of;isD.A number of;are 1.There are ( )students in our school and ( )the students is over 2000.A.a number of ; the nunber of B.the number of; the number of C.a number of ;a number of D.a number of;the number of 2.Jack found a bag ( )on the road and picked it up .A.lie B.lyi _____of students in our class is 65,___ of them are from Lianhu District.A.the number,a number B.the number,the numberC.a number,a number D.a number,the number ---How many students are there in your school?------------the students in our school --------over two thousand.A.The number of; is B.The number of; are C.A number of; is D.A number of; are 单项选择.A number of students _____ from the US.A.is单项选择.A number of students _____ from the US.A.isB.areC.comesD.was Only a small number of students come from the city.这句话中come怎么不带s,Only a small number of students不是一个整体吗