【单选题】 A biology teacher made several tests with different animals tn find out which animal was the cleverest ______.
A．
| [A] before long |
B．
| [B] long before |
C．
| [C] not long ago |
网考网参考答案：C
网考网解析：
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 查看试题解析出处>>
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