With the help of high technology, more and more new substances ___in the past few years.
A．discovered B．have discovered
C．had been discoveredD．have been discovered
D

試題分析：考查時態(tài)。根據(jù)時間狀語in the past few years,說明使用現(xiàn)在完成時。根據(jù)句意說明使用被動形式。句意：因為有高科技的幫助，早最近幾年中，越來越多的物質(zhì)已經(jīng)被發(fā)現(xiàn)了。故D正確。
點評：對于時態(tài)的考查要從關(guān)鍵詞著手，也要在語境中進行。
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