The teacher wondered ______. [br] A biology teacher made several tests with dif

游客2025-07-11  2

问题 The teacher wondered  ______. [br] A biology teacher made several tests with different animals tn find out which animal was the cleverest  ______.

选项 A、before long
B、long before
C、not long ago

答案 C

解析 根据第一段第一句中的recently可判断是not long ago不久前,before long不久,long before很久以前
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