【題目】There is “u” and “s” in the word “useful”.
A.an, a
B.an, an
C.a, a
D.a, an

【答案】D
【解析】句意：在單詞useful中有一個(gè)字母u和一個(gè)字母s。u是輔音音素開頭，故用不定冠詞a修飾，s是元音音素開頭，故用不定冠詞an修飾，故選D。

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