【題目】The inventor is satisfied to see a number of new products _____ after countless efforts.

A.developB.developedC.developingD.to develop

【答案】B

【解析】

考查非謂語動詞。句意:經(jīng)過無數(shù)的努力,發(fā)明家很滿意地看到許多新產(chǎn)品被開發(fā)出來。此處productsdevelop之間是一種被動關(guān)系,用過去分詞作賓語補(bǔ)足語,故選B。

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