摘要： I think lesson is the most difficult in this book. (5)

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I think ________ lesson is the most difficult in this book．

A.
five
B.
fifth
C.
the fifth
D.
fifteen

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I think ________ lesson is the most difficult in this book.

A. five

B. fifth

C. the fifth

D. fifteen

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根据句子意思，用所给单词的正确形式填空。

I think the ________ lesson is the most difficult in this book. (four)

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