——Is it my appearance the professor minds?——I guess not. He will consider necessary to have an experienced assistant.A.which；itB.that；itC.which；thatD.that;that
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B解析本本题考查强调句及it作形式宾语。第一句考查强调句，强调宾语my appearance;第二句it作形式宾语，真正的宾语是不定式to have an experienced assistant。