The airline requested a______call to ensure a seat on my flight back home.

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问题 The airline requested a______call to ensure a seat on my flight back home.

选项 A、confirm
B、confirmed
C、confirming
D、confirmation

答案D

解析本题需选择适当的词形。因a______call是requested的宾语，横线处应填入修饰call的形容词或与call共同构成名词短语的名词。“确认电话”是一个复合名词，故(D)confirmation正确。

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