Bothofthesemedicines
问题详情:
Both of these medicines _________beneficial to mankind since they were invented.
A. have been proved B. proved C. have proved D. are proved
【回答】
C
知识点:现在完成时及其被动式
题型:选择题
问题详情:
Both of these medicines _________beneficial to mankind since they were invented.
A. have been proved B. proved C. have proved D. are proved
【回答】
C
知识点:现在完成时及其被动式
题型:选择题