What are they talking about？
They are talking about the greatest inventions _____ have made a big difference to our daily life．（ ）
| A． |
which |
B． |
who |
C． |
that |
What are they talking about？
They are talking about the greatest inventions _____ have made a big difference to our daily life．（ ）
| A． |
which |
B． |
who |
C． |
that |
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