Question

【题目】The professor, together with some students, ______________ the lecture hall at that time.

A. were enteringB. are enteringC. was enteringD. is entering

Answer 1

【答案】C

【解析】

句意：教授和一些学生当时正在进入讲堂。at that time“当时；在那时”的意思，用在句子中是过去进行时。排除B/D。又因为本句话的主语是The professor为单数，而together with some students只做伴随用的。所以用was entering。故选C。