It's a pleasure to be ( ) help.

A:to B:of C:with D:for

It’s a pleasure to be（）help．

A:to B:of C:with D:for

It's a pleasure ( )be of help.

A:to B:for C:form D:on

It’s a pleasure to be( )help．

A:to B:of C:with D:for

It's a pleasure to be ( ) help.

A:to B:of C:with D:for

It's a pleasure ( )be of help.

A:to B:for C:form D:on