【題目】A recent research shows that there _____ volcanic activities on the moon and Mars. However, they no longer exist now.

A. had been B. has been C. were D. would be

【答案】C

【解析】

試題分析：考查時(shí)態(tài)。根據(jù)下文的However, they no longer exist now.可知，現(xiàn)在它們不再存在了，故可以判斷是曾經(jīng)存在，故使用一般過(guò)去時(shí)，選擇C。句意為：最近的研究表明在月球和火星上曾經(jīng)有火山運(yùn)動(dòng)。

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