Scientists have long struggle with how to measure the effects of climate change on wildlife.
A. have
B. struggle with
C. effects
D. on wildlife
A. have
B. struggle with
C. effects
D. on wildlife
【答案】
A. have
B. struggle with
C. effects
D. on wildlife
A. have
B. struggle with
C. effects
D. on wildlife
【答案】
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