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The result of the experiment was very good, ________ we hadn’t expected．

when

that

which

what

选择最佳答案，完成非限制性定语从句

This is Mr．Smith, ________ I think has something interesting to tell us．

who

whom

that

/

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He is a man of great experience, ________ much can be learned．

who

that

from which

from whom

选择最佳答案，完成非限制性定语从句

He must be from Africa, ________ can be seen from his skin．

that

as

who

what

选择最佳答案，完成非限制性定语从句

________, the compass was first invented in China．

It is known to all

It is known that

We all know

As is known to all