单项选择题

Modern economics ________ the country‘s agricultural policies.（）

A. undergoes
B. understands
C. underlies
D. undertakes

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She couldn‘t ________ the meaning of the poem because it’s too vague.A. work withB. work outC. work atD. work up
单项选择题
She couldn‘t ________ the meaning of the poem because it’s too vague.（）

A. work with
B. work out
C. work at
D. work up
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