i _______for three hours when i suddenly became sick.A.had been w_其他解答

i _______for three hours when i suddenly became sick.
A.had been working B.would work C.have worked D.am working

人气：283 ℃　时间：2020-06-12 09:02:22

解答

would work是本应该工作.have worked是过去完成时,与正好突然生病不对.am working就不解释了.had been working是“过去三个小时一直在工作”.