【題目】The doctor asked me to take the medicine before meals, three at time.

A.anB.aC./D.the

【答案】B

【解析】

句意:醫(yī)生讓我飯前吃藥,一次三粒。

考查冠詞。an不定冠詞,用于元音音素前;a不定冠詞,用于輔音音素前;C. /零冠詞;D. the定冠詞。結(jié)合句意可知,此空是一次三粒的意思,根據(jù)空后單詞time是以輔音音素開頭的單詞,此空應(yīng)填不定冠詞a,故選B

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