问题
选择题
We have helped the animals in danger __________ it has still 
a lot of things to do.[ ]
A. so
B. and
C. but
D. /
答案
答案：C
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We have helped the animals in danger __________ it has still a lot of things to do.[ ]
A. so
B. and
C. but
D. /
答案：C