摘要：31．The students busily when Mrs．White went to get a book she in the classroom． A．had written.left B．were writing.has left C．had written.had left D．were writing.had left
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One of ________ in our class is from the USA.
- A.students
- B.student
- C.the student
- D.the students
All the students stopped ________ when the teacher came in．
- A.talk
- B.to talk
- C.talking
- D.talked