Trenches in the ocean floor are of Agreat interest because they are Blines where the earth’s crust is often Cso weak to resist t

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问题 Trenches in the ocean floor are of Agreat interest because they are Blines where the earth’s crust is often Cso weak to resist the impact of Dfrequent earthquakes.

选项 A、 
B、 
C、 
D、 

答案C

解析 So weak is incorrect before the infinitive to resist. Correction: too weak.
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