sp1和sp2和sp3杂化:The leader of the party was examning the soil.He was___.

来源：百度文库 编辑：查人人中国名人网 时间：2024/05/09 00:04:11
a)testing it
b)looking at it carefully
c)watching it
d)trying it
我觉得应该是A吧，但答案却写的是B，为什么啊？
为什么不是test呢？说明一下理由哦！

examine = look ... carefully

过去完成时 前后时态一致
looking at 是固定搭配 所以选B

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