It is from my grandparents ______ I learned a lot.

A．have negative effects on his study
B．develop his individualism but limit his intelligence
C．eventually lead to his leaving school
D．have nothing to do with his achievements in a course

A．They know more about the causes of the drought.
B．They have a better understanding of the drought in Africa.
C．They have realized that the drought in Europe is the most serious one.
D．They have realized that droughts hit not only Africa but also Europe.