About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.

A.two dozen; beforeB.two dozens; thatC.two dozens of; beforeD.dozens; that

A

解析試題分析:句意:大約有12個(gè)基因有關(guān)的藥物已經(jīng)在測(cè)試中。在他們付諸實(shí)施之前不會(huì)很長(zhǎng)時(shí)間的。dozen前有具體數(shù)字時(shí),不加s,不加of,表虛數(shù)可指時(shí)加“s”,加“of”。第二空根據(jù)句意判斷。故選A
考點(diǎn):dozen一詞
點(diǎn)評(píng):dozen與score,hundred,thousand,million極為相似,所以這里將它們放在一起敘述:當(dāng)這些詞與具體數(shù)字連用時(shí),不用復(fù)數(shù)形式,也不后接介詞of。當(dāng)這些不與具體數(shù)字連用,而是表示不確定的泛指數(shù),則不僅要用復(fù)數(shù)形式,而且要后接介詞 of,然后才能后接名詞。當(dāng)這些詞與 a few,several,many 等數(shù)目不很具體的詞連用時(shí),用不用復(fù)數(shù)形式均可,但是注意:不用復(fù)數(shù)形式,其后的介詞of可以省略;用復(fù)數(shù)形式,其后介詞 of不能省略。當(dāng)這些詞后面的名詞有了the,these,those 等特指限定詞修飾時(shí),或其后的接的是us,them這樣的人稱代詞時(shí),則此時(shí)必須用介詞 of

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