【題目】Listen! Birds outside ______ to welcome the arrival of the spring.

A.are singingB.have sungC.singD.sang

【答案】A

【解析】

句意:聽(tīng)!外面的鳥(niǎo)兒們?cè)诔,歡迎春天的到來(lái)。

are singing正在唱歌,現(xiàn)在進(jìn)行時(shí);have sung現(xiàn)在完成時(shí);sing唱歌,動(dòng)詞原形;sangsing的過(guò)去式。根據(jù)句意和句中的Listen可知,這里表示去聽(tīng)一個(gè)正在發(fā)生的動(dòng)作,應(yīng)用現(xiàn)在進(jìn)行時(shí),故選A

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