21．This book is said to be a special one whichmany events not found on other history book

问题补充：

21．This book is said to be a special one, whichmany events not found on other history books.

A. writes

B. covers

C. instructs

D. conveys

答案：

A. writes

(答案→)B. covers

C. instructs

D. conveys

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