---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
---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
C