2019年mba考试英语模拟题——名词1242

{01}It’s the second time that I _______ in Beijing. What great changes! It’s years since I ________ here last time. A.went; had left B.had been; left C.have been; left D.have; had left 解析：在It’s the second time that…句型中，从句用现在完成时态。
本题选C。

{02}Only when __________________ permission _______________ allowed to enter the lab. A.a teacher has given; are the students B.has a teacher given; are the students. C.has a teacher given; the students are D.a teacher has given; the students are 解析：only 引导的状语从句放句首时，主句要倒装。
本题选A。