问题
选择题
The young pioneers kept on working in the fields ________ they felt tired and thirsty.[ ]
A. but
B. or
C. even though
D. since
答案
答案：C
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The young pioneers kept on working in the fields ________ they felt tired and thirsty.[ ]
A. but
B. or
C. even though
D. since
答案：C