单项选择题

If one does not pick up (his) dry-cleaning (within) thirty days, the management is not (obligated) to return it (back).

A. his
B. within
C. obligated
D. back
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The author of the book has shown his remarkably keen ______ into human nature.
A．intellect
B．insight
C．perception
D．understanding
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The more a nation's companies ______ factories abroad, the smaller that country's recorded exports will be.
A．lie
B．locate
C．spot
D．stand
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