问题补充:
example of John shows that knowledge of first aid can help a lot.
A. The; a
B. An; 不填
C. An; a
D. The; 不填
答案:
(答案→)A. The; a
B. An; 不填
C. An; a
D. The; 不填
解析:考查冠词的用法;第一空填the,特指约翰的例子,第二空填a,a knowledge of first aid指急救知识,句意是:约翰的例子表明急救知识帮助很大。选A。
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