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英语单选(二:3)This new method of mining for opals is very popular

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英语单选(二:3)This new method of mining for opals is very popular in Australia
This new method of mining for opals is very popular in Australia because it calls for __ equipment than the ___ one
A.less;elder
B.fewer;older
C.fewer;elder
D.less;older
答案是什么?
为什么?
谢谢
英语单选(二:3)This new method of mining for opals is very popular
D
equipment是不可数的所以用less
elder只能指人年龄较大的,不能表示旧的,以前的