Question

Some people still think advertisement is _waste o

Some people still think advertisement is _waste of time instead of _industry.请问这道题为什么选b

Answer 1

Some people still think advertisement is (a) waste of time instead of (an) industry.

a waste of time是固定搭配短语。
an industry 表示一个产业。

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追问

这句话该如何理解呢

追答

一些人依旧认为广告只是在浪费时间而不是一个产业。