单选题 He expected the House to pass the bill by a comfortable ______.
A. maple B. marble C. marsh D. margin

【正确答案】 D
【答案解析】[解析] (margin差额，幅度)。句意为：他希望上议院能以令人欣慰的差额通过这项议案。A．maple枫树；B．marble大理石；C．marsh沼泽。