Gaining a new customer costs ______ keeping an old one.

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问题 Gaining a new customer costs ______ keeping an old one.

选项 A、as many as five times
B、five times as many as
C、as much as five times
D、five times as much as

答案D

解析 本题测试倍数的表达方法。“A + be + 倍数 + as + 计量形容词原级 + as + B”如:This tree is three times as tall as that one. 这棵树是那棵树的三倍高。请注意:一倍用once,两倍用twice。
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