請做下面這道考題：
“Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I think I saw it somewhere.”
A. a, the B. the, the
C. a, a D. the, a
【陷阱】誤選A，生搬硬套冠詞用法規則：第一次提到某人或某事物用不定冠詞，第二次再提到該人或該事物時用定冠詞。
【分析】最佳答案為C。第一空填a，比較好理解；而第二空填a是因為此句中的one 並非指前面提到的 pen，即這裡的 one 與前面的 pen 並非同一事物，這從後面一句的 I think I saw it somewhere 可以清楚地知道。請比較下面一題：
“Have you seen _____ pen? I left it here this morning.” “Is it _____ black one? I found it in the corner.”
A. a, the B. the, the
C. a, a D. the, a
此題的最佳答案是 A不是C。請注意其後 I found it in the corner這一信息，它表明說明者是拿著筆在與對方說話。請再看一個類似的例子(from www.yygrammar.com)：
“Have you seen _______ new bike? I put it here just now.” “Is it _______ white one? A boy has ridden it away.”
A. a; a B. a; the
C. the; the D. the; a
此題答案選A，注意其後的 A boy has ridden it away 表明自行車已不在說話者身旁。
另外，請看下面一道類似的考題，也很容易錯：
My friend Mary is _____ beautiful girl and _____ girl everyone likes to work with.
A. a, a B. a, the
C. the, a D. the, the
【陷阱】很容易誤選B，認為第一次提到 girl 用不定冠詞，第二次提到就應該用定冠詞。
【分析】最佳答案為A。句中第二次提到 girl 時並不是特指的，此句實為一省略句，補充完整為 My friend Mary is a beautiful girl and she is a girl everyone likes to work with. 請再做以下試題：
(1) Jim is _______ brave boy and _______ boy never fearing anything.
A. a, a B. a, the
C. the, a D. the, the
(2) It is really _______ useful dictionary and _______ dictionary every one of us needs.
A. a, a B. a, the
C. the, a D. the, the
(答案均選A)
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