The teacher wondered ______. A biology teacher made several tests with different animals tn find out which animal was the clev

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问题 The teacher wondered ______.
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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