Mr Wang is one of the teachers in our school to the U.S .twice.A who has been B that has been C which has been D who have been

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Mr Wang is one of the teachers in our school to the U.S .twice.
A who has been B that has been C which has been D who have been

D
who指代the teachers in our school,所以要用who have been.

A

D
who指代the teachers in our school。

A

D

c is right

A

d

A

D
who指代the teachers in our school,所以要用who have been。