_______ good knowledge of several languages is essential to _____ study of comparative literature because without it one can read books only in translation.

A. A; the　　　　　 B. A; /　　　　 C. The; the　　　　　 D. /; the

________ good knowledge of several languages is essential to ________ study of comparative literature because without it one can read books only in translation．

1. A.
   A; the
2. B.
   A;/
3. C.
   The; the
4. D.
   /; the

He ________ a good knowledge of Chinese history．You can ask him about the ancient China．

1. A.
   conducts
2. B.
   controls
3. C.
   contains
4. D.
   commands