According to Professor Johnson，we don't have to read the book if we don't want to，as it is ______．（ ）
| A． |
worthwhile |
B． |
necessary |
C． |
optional |
D． |
serious |
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According to Professor Johnson，we don't have to read the book if we don't want to，as it is ______．（ ）
| A． |
worthwhile |
B． |
necessary |
C． |
optional |
D． |
serious |
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