单选题
Gaining a new customer costs ______ keeping an old one.
A、
as many as five times
B、
five times as many as
C、
as much as five times
D、
five times as much as
【正确答案】
D
【答案解析】
[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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