一Who's boy under the tree?

一Bill. He's active boy.

A. a; an B. a; the C. the; a D. the; an

D 【解析】句意：——樹下的那個男孩是誰？——比爾，他是一個活潑的男孩。問句是特指樹下的那個男孩，故用定冠詞the來表示特指；答語是表達一個活潑男孩，故用不定冠詞，active是以元音音素開頭，故用an，答案為D。
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