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试卷名称:GMAT（QUANTITATIVE）数学模拟试卷3

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In triangle ABC above, if ∠BAD and ∠ADB have measures of 4n, ∠ACB has a measure of n, and ∠DBC has a measure of 45°, what is the measure of ∠ABC? (Figure not necessarily drawn to scale.)

A．45°

B．60°

C．90°

D．105°

E．120°

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