【題目】One day in 1939, Norman Bethune cut his finger during ______ operation.

A.aB./C.anD.the

【答案】C

【解析】

句意:1939年的一天,白求恩在一次手術中割破了手指。

考查冠詞。句中指代的是“在一次手術期間”,英語中指代數(shù)量“一”要用不定冠詞,而operation是元音音標開頭的單詞,所以要用an,故選C

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