With the help of high technology, more and more new substances ______ in the past 10 years.
A．discoveredB．have discovered
C．had been discoveredD．have been discovered
D
考查時態(tài)。in the past+時間段，后用現(xiàn)在完成時態(tài)。句意：在先進(jìn)技術(shù)的幫助下，在這十年間越來越多的新物質(zhì)被發(fā)現(xiàn)。故選D。
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