单项选择题

In the past twenty years, he has （）great wealth by hard work.

A. asserted
B. undertaken
C. recollected
D. accumulated

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单项选择题

Then by 2020 its average income will have risen to almost $13, 000 ( measured at purchasing-power parity), （）equivalent to Spain’s today.

A. roughly
B. respectively
C. readily
D. rarely

单项选择题

I have （） much time and thought on the problem, but I am no nearer to finding a solution.

A. exposed
B. extended
C. exhausted
D. exerted

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