问题
单项选择题
（）for many years，the AB passed the examination and became an officer.
A.Having ignored him
B.To have been ignored
C.To be ignored
D.Having been ignored
答案
参考答案：D
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（）for many years，the AB passed the examination and became an officer.
A.Having ignored him
B.To have been ignored
C.To be ignored
D.Having been ignored
参考答案：D
溶液，应称量