摘要： ---You may find the key to the maths problem on page 107. ---Ah, it’s so simple . I wonder why I of that. A. hadn’t thought B. haven’t thought C. didn’t think D. wasn’t thinking

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---You may find the key to the maths problem on page 107 .

   ---Ah, it’s so simple . I wonder why I         of that .

         A. hadn’t thought            B. haven’t thought

         C. didn’t think                     D. wasn’t thinking

 

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---You may find the key to the maths problem on page 107.

   ---Ah, it’s so simple. I wonder why I ________ of that.

A. didn’t think     B. haven’t thought  C. wasn’t thinkingD. hadn’t thought

 

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---You may find the key to the maths problem on page 107.

---Ah, it’s so simple. I wonder why I ______ of that.


  1. A.
    didn’t think
  2. B.
    haven’t thought
  3. C.
    wasn’t thinking
  4. D.
    hadn’t thought
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— You may find the key to the maths problem on page 107.
— Ah, it's so simple. I wonder why I _____ of that.
[     ]

A. hadn't thought
B. haven't thought
C. didn't think
D. wasn't thinking

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— You may find the key to the maths problem on page 107.

— Ah, it’s so simple. I wonder why I ＿of that.   

       A. hadn’t thought                             B. haven’t thought              

       C. didn’t think                                  D. wasn’t thinking

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