Proper controls that should __________ developed as part of routine safety procedures were not in place. 选择一项： A. has been B. have been C. be

Proper controls that should __________ developed as part of routine safety procedures were not in place.
选择一项：
A. has been
B. have been
C. be

出自：国家开放大学-人力资源管理-管理英语3

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