定语从句（ 1）1. We should learn from those are always ready to help others.A. whoB. whomC. they2. Mr. Herpin is one of the foreign experts who in China.A. worksB. is workingC. are working3 . Tom is the only one of the students who to Shanghai.A. have goneB. have beenC. has been4. I, your good friend, will try my best to help you out.A. who isB. who amC. that is5. The old man has two sons, are lawyers.A. both of themB. both of whoC. both of whom6. He is a man
