Professor Smith was too busy to speak to me.I had come specially to see him.将这两句话并成一句,其中须含关系分句

i had come specially to see him,but prefessor smith was too busy to speak to me

I had come specially to see Professor Smith,but he was too busy to speak to me. 楼上几位大哥，要注意明确主语在前还有因果关系嘛~

I had come specially to see Professor Smith,who ,was too busy to speak to me.

Professor Smith was too busy to speak to me,so I had come specially to see him.因果关系