阿摩線上測驗
10. At least five different courses in programming languages _____ since March of last year, including the
popular introductory course on Python.
(A) were cancelling
(B) cancelled
(C) have been cancelled
(D) be cancelling
答案：登入後查看
統計： A(6), B(11), C(126), D(6), E(0) #3332089
統計： A(6), B(11), C(126), D(6), E(0) #3332089
