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21、One cause of high oil prices is the weak American dollar. Oil is       in dollars, so a less valuable dollar buys less oil.

A.traded           B.bargained         C.exchanged         D.attached

21、A

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One cause of high oil prices is the weak American dollar. Oil is       in dollars, so a less valuable dollar buys less oil.

A.traded           B.bargained         C.exchanged         D.attached

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