—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
网友回答
(答案→)A. a; the
B. the; the
C. a; a
D. the; a
解析：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