A．forB．ofC．byD．as

【C4】A．fromB．ofC．byD．with

【29】A．forB．onC．byD．with

【C18】A．forB．ofC．toD．with

This is a matter ____ some difficulty.A: inB: ofC: byD: for

【C12】A．inB．ofC．byD．for

【C7】A．forB．ofC．toD．on