问题
选择题
—My son is lost . Have you seen a boy passing by here?
—I saw boy hidden behind tree over there . You may go and have a look.
A．a; the
B．the; the
C．a; a
D．the; a
答案
答案：A
第一个空用不定冠词表示后者曾见过一个男孩，不一定是问话者所要找的；第二个空为特指，表示“那儿的那棵树”，用“the”.故选A