30. (单选题) Doctors are now able to cure people of some diseases which in former time _____. ( )(本题1.0分) A、 had killed them B、 must kill them C、 should kill them D、 would have killed them

30. (单选题) Doctors are now able to cure people of some diseases which in former time _____. ( )(本题1.0分)
A、 had killed them
B、 must kill them
C、 should kill them
D、 would have killed them

出自：西安石油大学英语二

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