公共英语考试

【单选题】 A biology teacher made several tests with different animals tn find out which animal was the cleverest ______.
A．before long
B．long before
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>>