题目内容
About ____ gene-targeting drugs are already in testing pipeline. It won’t be long ____ they are put into effect.
A.two dozen; before | B.two dozens; that | C.two dozens of; before | D.dozens; that |
A
解析试题分析:句意:大约有12个基因有关的药物已经在测试中。在他们付诸实施之前不会很长时间的。dozen前有具体数字时,不加s,不加of,表虚数可指时加“s”,加“of”。第二空根据句意判断。故选A
考点:dozen一词
点评:dozen与score,hundred,thousand,million极为相似,所以这里将它们放在一起叙述:当这些词与具体数字连用时,不用复数形式,也不后接介词of。当这些不与具体数字连用,而是表示不确定的泛指数,则不仅要用复数形式,而且要后接介词 of,然后才能后接名词。当这些词与 a few,several,many 等数目不很具体的词连用时,用不用复数形式均可,但是注意:不用复数形式,其后的介词of可以省略;用复数形式,其后介词 of不能省略。当这些词后面的名词有了the,these,those 等特指限定词修饰时,或其后的接的是us,them这样的人称代词时,则此时必须用介词 of
练习册系列答案
相关题目
About _______ gene-targeting drugs are already in testing pipeline. It won’t be long ______ they are put into effect.
A.two dozen; before |
B.two dozens; that |
C.two dozens of; before |
D.dozens; that |