问题描述：
11. I _____ to understand the group of students,...
11. I _____ to understand the group of students, but really it is _____.
A. tried; a labour B. laboured; labour
C. managed; labour D. laboured; a labour
please translate
11. I _____ to understand the group of students, but really it is _____.
A. tried; a labour B. laboured; labour
C. managed; labour D. laboured; a labour
please translate
问题解答：
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