We all know that he is an expert ______ this area and can be trusted.
A: fo
B: out
C: in
A: fo
B: out
C: in
举一反三
- He is an expert at chemistry. We all call him a ( ) .
- _____ what he can do. He might get a job tomorrow. He might stay out of work for weeks. A: We didn’t know B: He doesn’t know C: There is no knowing D: It was known that
- It ____________(know) that he is an expert in linguistics.
- As we all know, Jack is experienced _____ the problem of this kind. A: to work out B: at working C: at working out D: for working out
- We have invited an expert ______ this area to give us a speech.