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


  1. A.
    two dozen; before
  2. B.
    two dozens; that
  3. C.
    two dozens of; before
  4. D.
    dozens; that
A
試題分析:句意:大約有12個基因有關(guān)的藥物已經(jīng)在測試中。在他們付諸實施之前不會很長時間的。dozen前有具體數(shù)字時,不加s,不加of,表虛數(shù)可指時加“s”,加“of”。第二空根據(jù)句意判斷。故選A
考點:dozen一詞
點評: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,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,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,或其后的接的是us,them這樣的人稱代詞時,則此時必須用介詞 of
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