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

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

admin2019-10-05  91
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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