问题
选择题
One way to understand thousands of new words in gain _____good knowledge of basic word formation.
A．/
B．the
C．a
D．one
答案
答案：C
当某些不可数抽象名词含义具体化，而被某些修饰词修饰时，前面要加不定冠词。如a betty understanding of the passage , a good knowledge of English