Our grade held the grown-up ceremony on March, 21st, I have been well aware of my responsibility for our society. A. when B. during which C. since then D. since when 【查看更多】

 

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Our grade held the grown-up ceremony on March, 21st, _____ I have been well aware of my responsibility
for our society.

[     ]

A. when
B. during which
C. since then
D. since when

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Our grade held the grown-up ceremony on March, 21st, _____ I have been well aware of my responsibility for our society.

A. when           B. during which           C. since then         D. since  when

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