答案是A
因为是先完成discover ,然后再被人们相信.相信believed是过去时,所以,discover 这个动作在 believed以前发生这就是过去的过去,就是过去完成时.
语法：be believed to have done done -----被相信已经 - -- -
12.The monument was built in honor of the explorer who was b
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