《国民教育与民主主义》的作者是（），试图用马克思主义观点研究教育问题。
参考答案：克鲁普斯卡娅
The room was very dark, so I couldn't see anything _____. [ ]
A. enough clearly
B. enough clear
C. clearly enough
D. clear enough
Thank you for sending us ____ fresh vegetables of many kinds. You have done us ____ great service.
A. 不填; a
B. the; a
C. 不填; 不填
D. the; 不填
