【題目】With the help of high technology, more and more new substances ___in the past few years.

A. discoveredB. have discovered

C. had been discoveredD. have been discovered

【答案】D

【解析】

考查時態(tài)語態(tài)。句意:因為有高科技的幫助,在最近幾年中,越來越多的新物質(zhì)已經(jīng)被發(fā)現(xiàn)了。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)句意新物質(zhì)和發(fā)明之間用被動形式。故D正確。

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