【題目】I think the Grand Canyon is unusual natural wonder of the world.

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

【答案】B

【解析】

試題分析:句意:我認為大峽谷是世界罕見的自然奇觀。此題考查冠詞,因為unusual是以元音音素開頭的,故用an。根據(jù)句意,應(yīng)選B。

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