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單項選擇題

From this amount you need to（）something to cover utility bills.

A.contribute
B.attribute
C.subtract
D.contract

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You didn't have to write the essay if you didn't want to. It was（）

A.compulsory
B.suitable
C.alternative
D.optional

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Income tax rates are（）to one's annual income.

A.related
B.dependent
C.based
D.associated