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深基础工程必须编制单项的安全技术措施。()

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安全技术交底应分级进行、分级管理。()

安全生产和文明施工管理考评，满分30分。考评的主要内容是施工现场安全管理，外脚手架，基坑支护及模板工程，“三宝、四口、五临边”的使用或防护，施工用电，井架、塔吊或外用电梯，文明施工，文明工地创建等。()

_______ many times, he finally understood the problem.

A. Told
B. Telling
C. Having told
D. Having been told

Tom was about to close the windows _______ his attention was caught by a bird

A. when
B. suddenly
C. and
D. till