单项选择题

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单项选择题
When I try to understand ______ that prevents so many Americans from being as happy as one might expect, it seems to me that there are two reasons.
A. why it does
B. what it does
C. what it is
D. why it is
单项选择题
Advance in science more often than not encounters powerful opposition, ______ Darvin’s Theory of Evolu- tion.
A. as was the case with

B. such as the case of
C. as it did with

D. as in the case of
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