Sharksareatthetopofthefoodchain,
练习题6.34K
问题详情:
Sharks are at the top of the food chain, _______ if their numbers drop, the ocean’s ecosystem will be in danger.
A. but B. although C. so D. when
【回答】
C 前后因果关系所以用so. but但是,although 尽管 when 当…的时候。
知识点:连词
题型:选择题
标签:
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