单项选择题

What he described as a () detail I thought was the most important part of the plan.

A. common
B. plain
C. just
D. mere

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单项选择题

When I try to understand () that prevents so many Americans from being so happy as one might expect, it seems to me that there are two causes.

A. why it does
B. what it does
C. what it is
D. why it is

单项选择题

I had intended () him while he was living at Aberdeen.

A. to visit
B. visiting
C. to have visited
D. having visited

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