问题描述：
句型转换 I don't know what I should say at the meeting.（改为同义句）
I don't know what I should say at the meeting.（改为同义句）
I don't know ------ ------ ----- at the meeting.
I don't know what I should say at the meeting.（改为同义句）
I don't know ------ ------ ----- at the meeting.
问题解答：
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