In the past three decades ,_ significant advance has benn made in _ modern agriculture.

分类: 作业答案 • 2022-01-09 23:05:03

问题描述：

In the past three decades ,___ significant advance has benn made in ___ modern agriculture.
A a; /
B the ; a
C / ; the
D a; a
表泛指的时候,我怎么知道它是用a 还是/

答

第一个,表泛指,一个明显的进步.
第二空,表泛指,但是为不可数名词.
故选A
看名词的可数与不可数

In the past three decades ,___ significant advance has benn made in ___ modern agriculture.