问题
选择题
--- My son is lost. Did you see a boy pass by here?
--- I saw ______ boy hidden behind ______ tree over there. You may go and have a look.
A．a; the
B．不填；the
C．a; 不填
D．a; a
答案
答案：A
前空表示不确定的一个男孩；后空藏的地方为特指。
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