With the help of high technology, more and more new substances ______ in the past 10 years.A．discoveredB．have discoveredC．had been discoveredD．have been discove-高中英语-n多题

◎ 题干

With the help of high technology, more and more new substances ______ in the past 10 years.

A．discovered	B．have discovered
C．had been discovered	D．have been discovered

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◎ 解析

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