Choose one sentence that has the same meaning as the root one:

They arrange the tests in this book according to their difficult levels.
 

A.

The tests in this book are arranged in order of difficult.

B.

 The test in this book is arranged in order of difficulty.
  

C.

The tests in this book are arranged in order of difficulty.
 

D.

The tests in this book are arranged in the order of difficult.

Đáp án và lời giải
Đáp án:C
Lời giải:

The tests in this book are arranged in order of difficulty.
 

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