A．whichB．whomC．whoD．what

This is the book（)I have learned a lot.A. to whichB. by whomC. from which

【C10】A．whichB．whoseC．whoD．that

The old man has two daughters, ______ are doctors.A．both of themB．both of whomC．both whoD．

【C3】A．whichB．whoseC．thatD．what

The young man ______ teaches us English is from America.A: whoseB: whomC: whoD: which

【C9】A．whichB．whomC．whatD．who