单项选择题

Climate change, ______ the unfortunate Central Americans have contributed virtually nothing seems to be increasing the ferocity of nature in the isthmus.

A. for which
B. in which
C. by which
D. to which
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单项选择题
Materials that happen to be available in the school can yield educationally valuable material if ______ from a point of view of real understanding on the teacher’s part.
A. approached
B. approaching
C. being approached
D. to approach
单项选择题
In the sentence Stopping their slide into violent chaos requires a huge effort to provide more legal opportunities for young men , the italicized part grammatically functions as ______.
A. adverbial
B. complement
C. attribute
D. apposition
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