Scientists Ahave long Bstruggle with how to measure the Ceffects of climate chan

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问题 Scientists Ahave long Bstruggle with how to measure the Ceffects of climate change Don wildlife.

选项 A、
B、
C、
D、

答案 B

解析本题考查现在完成时。现在完成时的构成为have+done。故选择B，应改成struggled with。

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