一、单选题（共 10 题）1.It's ten o'clock. The students ________ a maths lesson. A.haveB.havingC.are havingD.is having2.Miss Li is busy ________ she still helps us a lot. A.butB.andC.orD.so3.John is policeman and wears ________ uniform every day. A.aB.anC.theD.／4.All students ________ wear un...
