---You may find the key to the maths problem on page 107. ---Ah, it’s so simple.
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---You may find the key to themaths 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’tthinkingD. hadn’t thought
试题答案
【答案】
A
【解析】略