who was in the classroom at that time?A.Yes,it's Jack B.None

who was in the classroom at that time?A.Yes,it's Jack B.None who was in the office at that time? were the twins in the classroom at that time?Yes,but they we He was only in _______ at that time.A．his 30’s B．the 30’s C． who is in the classroom?_____ a No one B Nothing C None D NO B ) 39.It was the third time that I _______ in at his office ____of the student s is in the classroom A Both B All C None it was difficult __ the railroad at that time.a.built b.to b 1.单项选择（ ） Who's _ boy in _ black?--It's jack.A.a,the B.the,\ Who's that at the door?____ is the postman.A.She B.This C.It Was it Jack that/who you met in the supermarket yesterday?这哥 A：who knocked at the door?B:I thought is was Jack.这里为什么用was,