Various efforts over the centuries _________ to predict earthquakes to reduce the damage.
A．a(chǎn)re being madeB．have been madeC．were madeD．were being made
B

試題分析：句意：幾個世紀(jì)以來，已經(jīng)做了各種努力來預(yù)測地震，減少損失。make efforts 做出努力，變被動形式。故選B。
考點: 考查動詞時態(tài)和語態(tài)的用法。
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