The leader of the party was examning the soil.He was___.a)testing itb)looking at it carefullyc)watching itd)trying it我觉得应该是A吧,但答案却写的是B,为什么不是test呢?

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The leader of the party was examning the soil.He was___.a)testing itb)looking at it carefullyc)watching itd)trying it我觉得应该是A吧,但答案却写的是B,为什么不是test呢?
The leader of the party was examning the soil.He was___.
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,
为什么不是test呢?

The leader of the party was examning the soil.He was___.a)testing itb)looking at it carefullyc)watching itd)trying it我觉得应该是A吧,但答案却写的是B,为什么不是test呢?
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